Толковый словарь английского языка Oxford English Reference - beta
Beta
beta
n. 1 the second letter of the Greek alphabet (B, {szlig}). 2 a second-class mark given for a piece of work or in an examination. 3 Astron. the second brightest star in a constellation. 4 the second member of a series. Phrases and idioms beta-blocker Pharm. a drug that prevents the stimulation of increased cardiac action, used to treat angina and reduce high blood pressure. beta particle (or ray) a fast-moving electron emitted by radioactive decay of substances (orig. regarded as rays). Etymology: ME f. L f. Gk
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1.
I. noun Etymology: Middle English betha, from Latin ~, from Greek bēta, of Semitic origin; akin to Hebrew bēth beth Date: 14th century the 2d letter of the Greek alphabet, ~ particle, a measure of the risk potential of a stock or an investment portfolio expressed as a ratio of the stock's or portfolio's volatility to the volatility of the market as a whole, a nearly complete prototype of a product (as software) , II. adjective Date: 1862 second in position in the structure of an organic molecule from a particular group or atom ...Толковый словарь английского языка
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