Webster's English Dictionary

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gamma

1. gam.ma \'gam-*\ n [ME, fr. LL, fr. Gk, of Sem origin; akin to Heb gi-mel 
   gimel] 1: the third letter of the Greek alphabet - symbol G or g  2: the 
   degree of contrast of a developed photographic image or of a televis ion 
   image 3: MICROGRAM 
2. gamma or g- aj : third in position in the structure of an organic 
   molecule from a partic ular group or atom