Толковый словарь английского языка Oxford English Reference - gamma
Gamma
gamma
n. 1 the third letter of the Greek alphabet. 2 a third-class mark given for a piece of work or in an examination. 3 Astron. the third brightest star in a constellation. 4 the third member of a series. Phrases and idioms gamma radiation (or rays) electromagnetic radiation of very short wavelength emitted by some radioactive substances. Etymology: ME f. Gk
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1.
I. noun Etymology: Middle English, from Late Latin, from Greek, of Semitic origin; akin to Hebrew gīmel gimel Date: 15th century the 3d letter of the Greek alphabet, the degree of contrast of a developed photographic image or of a video image, a unit of magnetic flux density equal to one nanotesla, ~ ray , microgram, II. adjective Date: 1896 of, relating to, or being one of three or more closely related chemical substances, third in position in the structure of an organic molecule from a particular group or atom ...Толковый словарь английского языка
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