Meaning of GAMMA in English

I. ˈgamə noun

( -s )

Etymology: Middle English, from Late Latin, from Greek, of Semitic origin; akin to Hebrew gīmel gimel

1. : the third letter of the Greek alphabet — symbol Γ or γ; see alphabet table


a. : the degree of contrast of a developed photographic image

b. : the slope of the straight-line portion of the characteristic curve of a photographic material or process

c. : a measure of the faithfulness with which the brightness variation in a television scene is reproduced in the displayed picture


a. : a unit of magnetic intensity equal to 0.00001 oersted

b. : a gamma-ray quantum

c. : one millionth of a gram : microgram

II. adjective

or γ- “

1. : of or relating to one of three or more closely related chemical substances


— used somewhat arbitrarily to specify ordinal relationship or to specify a particular physical form, especially an allotropic modification (as in γ-iron), or an isomeric or stereoisomeric form (as in γ-benzene hexachloride)

2. : third in position in the structure of an organic molecule from a particular group or atom or having a structure characterized by such a position

γ-hydroxy acids


3. : third in order of brightness — used of a star in a constellation

4. of streptococci : producing no hemolysis on blood agar plates

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.