n :  a subdivision of a species: as  a  :  a category in biological classification that ranks immediately below a species and designates a population of a particular geographical region genetically distinguishable from other such populations of the same species and capable of interbreeding successfully with them where its range overlaps theirs  b  :  a named subdivision (as a race or variety) of a species sub*spe*cif*ic adj 
 
   
 
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