n 1  :  the third letter of the Greek alphabet - symbol G or g  2  :  a unit of magnetic flux density equal to one nanotesla  3  :  GAMMA RAY - usu. used as the attributive form of gamma ray < counter>   4  :  MICROGRAM 1
or  g-  adj 1  :  of or relating to one of three or more closely related chemical substances <the gamma chain of hemoglobin>  <g-yohimbine>  - used somewhat arbitrarily to specify ordinal relationship or a particular physical form and esp. one that is allotropic, isomeric, or stereoisomeric (as in gamma benzene hexachloride)  2  :  third in position in the structure of an organic molecule from a particular group or atom : also  :  occurring at or having a structure characterized by such a position <g-hydroxy acids>   3  of streptococci  :  producing no hemolysis on blood agar plates .
 
 
 
Similar sounding terms:  cm or Cm or CM  CMA  co·ma  gm 
 
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