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beta US English

The second letter of the Greek alphabet (Β, β), transliterated as ‘b.’

beta New Oxford Dictionary for Writers & Editors

second letter of the Greek alphabet (Β, β), transliterated as ‘b’

Beta in beta US English

The second (usually second-brightest) star in a constellation

beta cell US English

Any of the insulin-producing cells in the islets of Langerhans

beta test US English

A trial of machinery, software, or other products, in the final stages of its development, carried out by a party unconnected with its development

beta test New Oxford Dictionary for Writers & Editors

(two words, hyphen as verb)

beta decay US English

Radioactive decay in which an electron is emitted

beta rhythm US English

The normal electrical activity of the brain when conscious and alert, consisting of oscillations (beta waves) with a frequency of 18 to 25 hertz

beta blocker US English

Any of a class of drugs that prevent the stimulation of the adrenergic receptors responsible for increased cardiac action. Beta blockers are used to control heart rhythm, treat angina, and reduce high blood pressure

beta particle US English

A fast-moving electron emitted by radioactive decay of substances. (The emission of beta particles was originally regarded as a ray.)

beta receptor US English

An adrenergic receptor in the sympathetic nervous system, stimulation of which results especially in increased cardiac activity

beta version US English

A version of a piece of software that is made available for testing, typically by a limited number of users outside the company that is developing it, before its general release

beta-adrenergic US English

Of, relating to, or affecting beta receptors

beta endorphin US English

An endorphin produced in the pituitary gland that is a powerful pain suppressor

Phi Beta Kappa US English

An honorary society of college and university undergraduates and some graduates to which members are elected on the basis of high academic achievement

beta ray in beta particle US English

A fast-moving electron emitted by radioactive decay of substances. (The emission of beta particles was originally regarded as a ray.)

carotene US English

An orange or red plant pigment found in carrots and many other plant structures. It is a terpenoid hydrocarbon with several isomers, of which one (beta carotene) is important in the diet as a precursor of vitamin A

globulin US English

Any of a group of simple proteins soluble in salt solutions and forming a large fraction of blood serum protein. The three principal subsets of globulin are alpha globulin, beta globulin, and gamma globulin, which are distinguished by their respective degrees of electrophoretic mobility (alpha having the greatest and gamma having the least)

beta waves in beta rhythm US English

The normal electrical activity of the brain when conscious and alert, consisting of oscillations (beta waves) with a frequency of 18 to 25 hertz

Beta vulgaris in beet US English

A herbaceous plant widely cultivated as a source of food for humans and livestock, and for processing into sugar. Some varieties are grown for their leaves and some for their large nutritious root

beta carotene in carotene US English

An orange or red plant pigment found in carrots and many other plant structures. It is a terpenoid hydrocarbon with several isomers, of which one (beta carotene) is important in the diet as a precursor of vitamin A

beta globulin in globulin US English

Any of a group of simple proteins soluble in salt solutions and forming a large fraction of blood serum protein. The three principal subsets of globulin are alpha globulin, beta globulin, and gamma globulin, which are distinguished by their respective degrees of electrophoretic mobility (alpha having the greatest and gamma having the least)

Beta vulgaris in mangel US English

A beet of a variety with a large root, cultivated as feed for livestock

Beta vulgaris in spinach beet US English

Beet of a variety which is cultivated for its leaves, which resemble spinach in taste and appearance

Beta vulgaris in subspecies US English

A taxonomic category that ranks below species, usually a fairly permanent geographically isolated race. Subspecies are designated by a Latin trinomial, e.g., (in zoology) Ursus arctos horribilis or (in botany) Beta vulgaris subsp. crassa