A ring; a ringlike part or space.
A space contained between the circumferences of two circles, one within the other.
The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
Ring-shaped structures or markings, found in, or upon, various animals.
A raised ring around the center of a flower.
A mark or marks formed on a fish scale or bone each year.
The ringlike area included between two concentric circles
The ring around a heart valve where the valve leaflet merges with the heart muscle.
in some Stapelieae, the portion of the corolla which forms a fleshy, raised ring.
Border to a porus produced either by a thickening or thinning of the sexine.
A structure shaped like a ring. For example, in the heart, the base of the mitral valve is termed the annulus.
The ring-like space between the top of the primer and the primer pocket or battery cup on the base of a cartridge.
The portion of a plane bounded by two concentric circles in the plane.
A ring of tough fibrous tissue which is attached to and supports the leaflets of the heart valve.
A ring of cells between the mouth of the capsule and the lid. These are hygroscopic of the capsule and roll back when dry, opening the capsule.
an attached to loose ring of cottony or membranous veil tissue left on the stem of a mushroom after expansion of the cap
The inner veil separates from the cap as it expands and remains attached to the stalk. It may appear as a skirt, fringe or web, either intact or in fragments.
a ring of tissue on the stipe of mushroom formed by the rupture of a membrane (the partial veil) connecting the cap and stipe of a developing mushroom. A special layer of tissue that connects the margin of a mushroom pileus to the stipe that can either form a ring around the stipe, hang as fragments from the margin of the pileus, or be variations of the two. Examples may be found in many genera such as Amanita, Cystoderma, Lepiota, and Suillus, among others.
(ferns and moss capsule) DIAGRAMS: PHOTOS: Fern Sporangium
a tube Each of the above is an annulus: a gluing diagram of an annulus, a ring, and a tube.
A ring-shaped structure surrounding a cardiac valve.
The skirtlike remnant of the partial veil which shields the lamellae as they produce the spores and protects the spores until they are ready for release. It surrounds the upper part of the mushroom stem below the cap and sometimes slips down. Not found on every mushroom. Also called "annular ring."
The outer ring of a bi-metallic coin or medal.
This is a remnant of the partial veil left as the mushroom matures. It often leaves a ring of membranous tissue around the stem (stipe)
A ring bordering a pore of a pollen grain, in which the ektexine is modified (usually thickened) ( Plate 23: 380).
(pl., annuli), a ring encircling an article, segment, spot or mark (T-B); annulet, q.v. (T-B); ringlike subdivision of the antennal flagellum (Chapman); in Tubulifera (Thysanoptera), incorrectly applied to periandrium or phallobase, q.v. (Tuxen, after Priesner; Heming); in Heteroptera (Hemiptera), anal tube, q.v. (Tuxen, after Verhoeff); in Lycaenidae (Lepidoptera), vinculum, q.v. (Tuxen, after van Eecke); in Hymenoptera, reinforcing struts at one or both ends of a segment of a gonapophysis (Tuxen, after Smith); in Hymenoptera, basal ring, q.v. (Tuxen, after Beck).
a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
(Fungi) remnant of the partial veil that in mature mushrooms surrounds the lower part of the stem
The thickened edge of the intercalary cuticle where it is perforated by a lateral septular pore. (Banta 1969)
a part, structure, or marking resembling a ring
A mark or ring that forms annually on the otoliths, scales, and other bones of fish, that correspond to the annual period of slow growth that fish go through. Annuli are used by fish managers to determine age and growth of fish.
The opening around the penetrant. For pipe Penetrations, the ring around the pipe where the fill material is applied.
The ring of cells in the moss or fern capsule that splits and allows liberation of spores.
diminutive of Latin anus = ring, hence little ring.
(pl. annuli, adj. annulate) An area of the exine surrounding a pore that is sharply differentiated from the remainder of the exine, either in ornamentation or thickness (( Jackson, 1928). Comment: Although the correct Latin spelling is anulus, the form used throughout the botanical literature is annulus. See also: aspis, costa, margo. Anulus (( Beug, 1961) Orthographical variant of annulus.
the elastic ring of cells in a sporangium that initiates dehiscence.
A ring-like part; or, the orifice of a hollow die, through which extruded metal flows from the press.
Describes a ring, or a ringlike or circular structure.
A ring of tough fibrous tissue at the base of the heart. This ring supports and anchors the heart valve(s) into the heart itself. There are 4 valve annuli...one each for the tricuspid, mitral, aortic, and pulmonary valves. These rings of fibrous tissue all converge together in the middle of the heart, and area known as the fibrous skeleton of the heart.
Flattened ring; circular plate with a central circular aperture
The tough outer ring of a spinal disk.
the ring of tissue left on the stalk (stipe) of a mushroom when the partial veil (pileus) breaks.
A membraneous skirt surrounding the stipe of a hymenomycete or gasteromycete. (pl. annuli) ( 15)
a ring; in ferns, the elastic ring of cells, forming part of the sporangium wall, that initiates dehiscence.
A ring of tough fibrous tissue that supports the leaflets of the heart valve. It is located between the valve leaflets and the heart muscle.
a ring; the area bounded by two concentric circles
Part of the heart from which the heart valves depart. It is a sort of tissue ring surrounding cusps.
specialized of some fern sporangia that are involved in the opening of the sporangium: on drying out the cells of the annulus contract and the sporangium ruptures, releasing the spores
Thick-walled ring of cells on the sporangium.
Any type of ring gear, including the ring part of the ring and pinion in the rear end, and the gears in the planetary gear set of an automatic transmission.
ring of tissue on the stem left from a torn partial veil; collar
A ring of tissue left attached to the Stem of a mushroom or toadstool when the Veil connecting the Cap and Stem ruptures as the young fruitbody develops
The tough outer ring of a spinal disc.
The region between two concentric circles (Lesson 9.6).
unevenly thickened cells found in spore case of ferns
In mathematics, an annulus (the Latin word for "little ring", with plural annuli) is a ring-shaped geometric figure, or more generally, a term used to name a ring-shaped object. The adjective form is annular (for example, an annular eclipse).
An annulus is the ring like structure sometimes found on the stipe of a mushroom. The annulus represents the remaining part of the partial veil, after it has ruptured to expose the gills or other spore-producing surface. An annulus may be thick and membranous, or it may be cobweb-like.