in chemistry, a group of elements or atoms usually passing intact from one compound to another, but usually incapable of prolonged existence in a free state.

A species with an odd number of electrons; formerly called free radical.

(rad'-i-cal) Negatively charged polyatomic (multiple) ions or molecular groups of ions that occur in many compounds, and which remain unchanged through chemical reactions. Examples are the borate (BO3)-3, carbonate (CO3)-2, sulfate (SO4)-2, phosphate ( PO4)-3, arsenate (As O4)-3, vanadate ( VO4)-3, and hydroxyl radicals ( OH)-.

a molecule with an odd number of electrons. Radicals do not have a completed octet and often undergo vigorous redox reactions. Radicals produced within cells can react with membranes, enzymes, and genetic material, damaging or even killing the cell. Radicals have been implicated in a number of degenerative conditions, from natural aging to Alzheimer's disease.

Compounds that act as a single atom when combining with other elements to form minerals. Radicals contain one or more unpaired electrons.

(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule than has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells"

a molecular entity (sometimes charged and sometimes neutral) which enters into chemical reactions as a unit

an atomic or molecular species having an unpaired, or odd, electron

an unstable molecule that ties to electrons from other molecules, thus causing damage

a species that contains unpaired electrons

A radical is a reaction intermediate where a bond is broken and the two parts of the molecule exist carrying a single unshared electron. The radicals are normally destroyed quickly by recombination or they break in another radical and a stable molecule.

An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species).

It is the compounds acting as a single atom when combined with other elements to form minerals. It contains one or more unpaired electrons.

molecules with free, unpaired electrons that are highly reactive chemically and with lives of around 10-8 seconds.

an unstable molecule, that generates its reactivity from its unpaired electron.

a highly reactive molecule that may pass intact from one compound to another but does not normally exist in a free state. See also free radical.

any group of atoms that goes in and out of chemical combination together without change.

a term applied to an atom or molecule having one or more free valencies. [See 'free radicals'.

1. A group of atoms acting as a single atom which go through chemical reactions without being changed.

In chemistry, radicals (often referred to as free radicals) are atomic or molecular species with unpaired electrons on an otherwise open shell configuration. These unpaired electrons are usually highly reactive, so radicals are likely to take part in chemical reactions. Because they are uncharged, their reactivity is different from the reactivity of similar ions.

Relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form.

Of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below.

A primitive word; a radix, root, or simple, underived, uncompounded word; an etymon.

A primitive letter; a letter that belongs to the radix.

A square root symbol.

The root of a quantity as indicated by the sign .

a sign placed in front of an expression to denote that a root is to be extracted

arising from or going to the root; "a radical flaw in the plan"

of or relating to or constituting a linguistic root; "a radical verb form"

especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem; "basal placentation"; "radical leaves"

a number that can be built up from roots, such as or

a special kind of number that is the root of a polynomial equation

Another name for the roots of numbers, such as the square root of 5 or \/.

The symbol used to denote the operation of taking a root.

The square root sign.

ˈɹædəkl̩] - adjective for things involving the tongue root.

Rationality Rationalism Rays Realism Realm Redemption Reductionism Refer Referring Region Relative Reflection Religion Religious root, Remember Representation Resistance Reintegration Rest Restless Restraint Retrocipation Revelation Rigid Romanticism Root

A radical is the positive part of the n-th root of a quantity. Examples: , , These may be simplified as 4, 3, 5x fraction with radicals in the denominator may be changed to an equivalent fraction without radicals in the denominator by rationalizing the denominator.

an expression that has a root (square root, cube root, etc.) (e.g., is a radical). Any root can be specified by an index number, , in the form (e.g., ). A radical without an index number is understood to be a square root.

Growing from or pertaining to a root; growing from a non-aerial stem.

radical is a symbol traditionally used to denote square roots, cube roots, etc. A radical function is the inverse of a (restricted) power function with positive integer power.

A radical (from Latin radix, meaning "root") is the semantic root (i.e., portion bearing the meaning) of an inflected European word. Early Western sinologists borrowed this term to refer to the semantic component(s) of Chinese character (Hanzi). Later, the term was also borrowed for a second meaning, the 部首 (Pinyin: bùshǒu, Japanese bushu, Korean busu), literally meaning "section header", under which a character is listed in the dictionary.

favoring fundamental change in society. Traditionally radicalism has been identified with the left, but radicals can be on the right too. Some would argue that in America today the radical agenda is that of the right rather than the left, although conservatives would say that special interest groups like feminists and gays are pushing a radical agenda. Radicalism has a long history in Europe from the eighteenth century on; in America it was advocated by Tom Paine.

Favoring or effecting fundamental or revolutionary changes in current practices, conditions, or institutions

(used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative"

markedly new or introducing radical change; "a revolutionary discovery"; "radical political views"

a person subscribing to a political ideology supporting massive

a politican whose views are

a political group that has views or policies of extreme change

one who wants big or revolutionary changes in current conditions or institutions, e.g. in politics or religion

Political viewpoint with origins in Western Europe during the 19th century; advocated broader voting rights than liberals; in some cases advocated outright democracy; urged reforms in favor of the lower classes. (p. 703)

Arising from the base of stem or rhizome.

The smallest meaningful components out of which an ideographic character is built.