A cavity, entrance, or passage; as, the atrium, or atrial cavity, in the body wall of the amphioxus; an atrium of the infundibula of the lungs, etc.

The hallway or courtyard in a Roman house. The centre of the atrium was open to the sky.

entrance hall of a Roman house, generally covered by an inward sloping roof with a large central opening ( compluvium) through which rainwater fell into a cistern ( impluvium) below.

An inner court that is open to the exterior, usually surrounded on all sides by a roof

Courtyard, often with arcades, placed in front of some early Christian churches

An open court within a building

A floor opening or series of floor openings connecting two or more stories that is covered at the top of the series of openings and is used for purposes other than an enclosed stairway; elevator hoistway; escalator opening; or utility shaft used for plumbing, electrical, air conditioning, or communication facilities.

the entrance or forecourt in a home. It is sometimes uncovered.

Courtyard or central hall of a building

the central area in a building; open to the sky

an interior courtyard and could be covered with glazing or a transparent skylight, to allow direct and diffused sunlight into the building

Small entrance court of Roman House.

The traditional central open area to a typical Roman private house. It was usually entered through a vestebulum (vestibule).

In classical architecture, an interior courtyard that is open to the air.

The main lobby of a hotel, several stories high, with patterned off Roman architecture. It was instituted by John Portman as a way to bring the outside into North American hotels where both warm and cold climates need to be controlled.

An open court in a Roman house or in front of a church.

Atrium (Latin) the central court of a Roman house Example 1 Example 2 Example 3

An interior courtyard or room built with an opening in the roof, usually over a pool or garden. Most often found in Roman domestic buildings. Also, the vestibule of a Early Christian basilica- plan church, usually roofed.

The main room of a Roman house out of which one had access to other parts of the house (see alae). There were many types including ones that were completely roofed ( testudinate), ones with openings to the sky ( compluvium), which had, underneath the openings in the house floor, as small rectangular depression to catch rainwater ( impluvium).

Latin = entrance hall, adjective - atrial.

An interior court to which rooms open.

( atrium) an interior courtyard that is open to the weather; or a significant interior space, often skylighted.

The court of a Roman house that is partly open to the sky. Also the open, collonnaded court in front of and attached to a Christian basilica.

An interior, often sky-lit, multi-deck, open area of a ship. Typically, atriums are centrally located near elevators, shops, restaurants, caf¨¦s, and guest services. Shipboard atriums can extend anywhere from two to ten decks or more.

an inner courtyard of a house or building that is open to the sky or covered by a skylight.

An entrance hall of a building, often rising through a number of storeys and containing lifts, reception areas and plants. Originally the hall or chief apartment of a Roman house.

the main hall of a traditional Roman house, which may contain a compluvium and impluvium

In the Roman period this was the inner courtyard of a house, left open to the sky, and generally built by the affluent urbam classes. In the 20th century the word has been adopted to describe dramatic enclosed glass-roofed indoor spaces associated with high-rise hotels and office buildings that are treated as substitutes for the public realm.

Glass cover for a courtyard.

A large space in a building open to the ceiling. An atrium usually has a glass ceiling or many windows to let in a lot of light.

A courtyard, open to the sky, in an ancient Roman house; the term also applies to the courtyard nearest the entrance of an early Christian church.

the large, main room in a Mediterranean and traditional Roman house. It might be completely roofed ( testudinate), but usually had a central opening in the roof ( compluvium) to catch rain in a square pool ( impluvium) directly beneath

Enclosed space that served to access some temples or palaces. Room like a vestibule at the entrance to a house.

Atrium In an ancient Roman house, the central courtyard. Today, an atrium may be covered with glass rather than open to the sky.

an architectural term referring to an interior court which is partially open to the sky; the central hall of a Roman house; also the open colonnaded court preceding a Christian basilica [image

A large area, which forms a courtyard within a building; often enclosed in glass and open to sunlight and may be several stories high.

A central courtyard with surrounding rooms opening off it.

Court of a Roman house, roofed at the sides and open in the middle; also the entrance to a Byzantine church.

In an ancient Roman structure, a central room open to the sky, usually having a pool for the collection of rainwater. In Christian churches, a courtyard flanked by porticos.

a heart chamber that receives blood from the veins; plural: atria

Either of the two upper chambers of the heart, in which blood collects before being pumped to the ventricles. (The plural is atria.)

(a´ tree um) • A body cavity, as in the hearts of vertebrates. The thin-walled chamber(s) entered by blood on its way to the ventricle(s). Also, the outer ear.

the upper chamber of each half of the heart. Also called the auricle.

The heart's smaller blood collection chamber. A normal heart has two atria.

a thin-walled receiving chamber in which blood accumulates in fishes.

The top chamber of the heart. There are two atria -- the left and the right, divided by a muscular wall, called the septum. The atrium contracts before the ventricle to allow optimal filling of the ventricle

Cardiac chamber - right atrium receives deoxygenated blood and left atrium oxygenated blood. Walls manufacture and release hormone, atrial natriuretic peptide, influencing the kidney.

the heart chamber that receives blood from the veins

pl. atria One of the upper two chambers of the heart (right and left atrium).

an upper chamber of the heart where blood collects before passing to the ventricle

Chambers in the heart where blood is collected and pumped through to the ventricles.

a chamber in the heart which collects blood, left from the lungs, right from the body.

the chamber to which the oviduct, penis (or epiphallus) and spermathecal duct are connected to, and which itself is connected to the outside by way of the genital pore

ATE-tree-um An upper heart chamber. 710

the upper two chambers (right and left) of the normal heart.

(A-tree-uhm) One of two superior chambers of the heart. Plural form is atria.

An upper chamber of the heart. Right atrium receives unoxygenated blood from the body. Left atrium receives oxygenated blood from the lungs.

one of the chambers of the heart that receives blood from the lungs or another part of the body and passes blood on to the ventricles.

The upper heart chamber, also known as the auricle. The atria act as a temporary resevoir for blood before sending it to the the lower heart chambers.

One of the two smaller chambers of the heart. Each atrium consists of an open space with recessed walls. The plural of atrium is atria. See the entire definition of Atrium

one of the two receiving chambers of the heart.

one of two upper chambers in the heart.

upper heart chamber (plural: atria)

(of the lateral ventricle) (L. an open court or hall): That part of the lateral cerebral ventricle where the body, occipital, and temporal horns become confluent. Also know as the Collateral trigone.

One of the two upper chambers of the heart in which blood collects before being passed to the ventricles. The right atrium receives oxygen-depleted blood from the body; the left atrium receives oxygen-rich blood from the lungs.

There are four chambers in the heart, two on the right side pumping to the lungs, and two on the left side pumping to the body. On each side there is an upper, low-pressure chamber that collects blood from the veins and delivers it to the ventricles, the main pumping chambers of the heart. These upper chambers are called the atria (plural) or atrium (singular).

one of the hollow cavities of the heart

One of two upper chambers of the heart. The right atrium receives deoxygenated blood from the superior and inferior vena cava and the coronary sinus, while the left atrium receives oxygenated blood from the pulmonary viens.

one of the chambers of the heart that receives blood directly from a vein.

one of the two upper chambers of the heart. The right atrium collects unoxygenated blood (blue blood) from the body. The left atrium collects oxygenated blood from the lungs.

One of the two upper chambers of the heart (right atrium and left atrium). Plural=atria.

One of the upper two chambers of the heart (plural: atria). The right atrium collects deoxygenated blood and the left atrium collects oxygenated blood before it is passed to the ventricles.

Either of the two upper chambers of the heart. Blood returned from the upper body to the heart from the veins enters the right atrium through the superior vena cava, and through the inferior vena cava from the lower body. The vena cava is the body's largest vein. Oxygen-rich blood is returned to the left atrium from the lungs.

(plural of atria) one of a pair of smaller cavities in the heart from which blood passes to the ventricles.

upper chamber of the heart receiving blood from the body and lungs and passing it to the ventricles

The chamber of the heart that collects blood returning from the rest of the body. In all vertebrates but fish, there are two atria, left and right. The right atrium collects deoxygenated blood from the body and passes it to the right ventricle. The left atrium collects oxygenated blood from the lungs and passes it to the left ventricle.

One of the two upper chambers of the heart. The right atrium receives blood depleted of oxygen from the veins; the left atrium receives blood with fresh oxygen from the lungs.

The upper chambers of the heart where blood enters after circulation.

the two smaller, upper chambers in the heart.

either one of the two upper chambers of the heart. Blood collects here before being passed to the ventricles. Also known as auricle.

The upper receiving chambers of the heart.

(plural atria). One of the two upper chambers of the heart. The left and right atria are divided by a wall called the interatrial septum. Click here to see a diagram.

atrium - hall] In the embryo, it is the chamber of the heart that receives blood from the sinus venosus and delivers blood to the ventricle.

(plural: atria), Top chambers of the heart: right and left. Right atrium receives blood from the body, and the left atrium receives blood from the lungs. When the atria contract in response to a normal electrical impulse, blood is ejected (pumped) into the ventricles.

The heart is divided into four chambers. The upper chambers are called atria, the lower chambers are called ventricles. The atria receive blood from the veins and pump the blood to the ventricles through the tricuspid (right) or mitral (left) valve. See the Heart's Function and Structure page for more information.

one of two upper chambers of the heart that receive blood from the veins and, in turn, pump it into the ventricles.

The upper chamber of the heart (plural: ATRIA). Acts as a reservoir for blood awaiting transit to the ventricles.

plural: atria) One of the two upper chambers of the heart. the left atrium receives newly oxygenated blood form the lungs, the right atrium receives deoxygenated blood form various parts of the body.

The smaller heart chambers (left and right) which simply receive the blood returning to the heart, as opposed to the ventricles, that do the actual pumping.

(plural = atria) — upper chambers of the heart, in the normal heart there is one right and one left. Return to the top

Upper heart chamber: it receives blood into the heart. In our heart we have two atria.

See atria.

(plural Atria): Either one of the two upper chambers of the heart in which blood collects before being pumped into the lower chambers (ventricles). See Overview.

One of the two upper chambers of the heart. The right atrium pumps blood into the right ventricle, and the left atrium pumps blood into the left ventricle.

Either one of the two upper chambers of the heart in which blood is received from the body before being passed to the ventricles.

one of the two upper chambers of the heart. The left atrium fills with oxygenated blood from the lungs. The right atrium fills with deoxygenated blood returning from the body.

One of the upper chambers in the heart.

One of two small upper receiving chambers of the heart; plural form is "atria."

In anatomy, the atrium (plural: atria) refers to a chamber or space. As such it may for example be the atrium of the lateral ventricle in the brain or, popularly, the blood collection chamber of a heart. It has a thin-walled structure that allows blood to return to the heart.

In architecture, an atrium (plural atria) is a large open space, often several stories high and having a glazed roof and/or large windows, often situated within an office building and usually located immediately beyond the main entrance doors. Atria are popular with companies because they give their buildings "a feeling of space and light", but have been criticised by fire inspectors as they could allow fire to spread to a building's upper stories more quickly.