Webster's English Dictionary

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genus

ge.nus \'je--n*s\ \'jen-*-r*\ n or gen.era [L gener-, genus birth, race, 
   kind - more at KIN] pl  1: a class, kind, or group marked by common 
   characteristics or by one commo n characteristic; specif : a category of 
   biological classification ranking between the family and the species, 
   comprising structurally or phylogenetically related species or an isolated 
   species exhibiting unusual differentiation, and being designated by a Latin 
   or latinized capitalized singular noun 2: a class of objects divided into 
   several subordinate species