Webster's English Dictionary

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species

1. spe.cies \'spe--(.)she-z, -(.)se-z\ n or species [L, appearance, kind, 
   species - more at SPY] pl  1a: a class of individuals having common 
   attributes and designated by a com mon name; specif : a logical division of 
   a genus or more comprehensive class 1b: KIND, SORT  1c1: a category of 
   biological classification ranking immediately below the  genus or subgenus, 
   comprising related organisms or populations potentially capable of 
   interbreeding, and being designated by a binomial that consists of the name 
   of its genus followed by a Latin or latinized uncapitalized noun or 
   adjective agreeing grammatically with the genus name 1c2: an individual or 
   kind belonging to such a species  1d: a particular kind of atomic nucleus 
   or atom  2: the consecrated eucharistic elements; specif : the accidents of 
    the eucharistic bread and wine as distinguished in Roman Catholicism from 
   their substance 3a: a mental image; also : a sensible object  3b: an object 
   of thought correlative with a natural object 
2. species aj : belonging to a biological species as distinguished from a 
   horticultural  variety {a ~ rose}