Hypertext Webster Gateway: "differentia"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Differentia \Dif`fer*en"ti*a\, n.; pl. {Differenti[ae]}. [L. See
{Difference}.] (Logic)
The formal or distinguishing part of the essence of a
species; the characteristic attribute of a species; specific
difference.
From WordNet (r) 1.7 (wn)
differentia
n : a distinguishing characteristic esp in different species of
a genus
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