differentia
Pronunciation: /ˌdifəˈrenSH(ē)ə/
noun (plural differentiae /-SHēˌē/)
1 A distinguishing mark or characteristic.
1.1 chiefly Philosophy An attribute that distinguishes a species of thing from other species of the same genus.
Origin
late 17th century: from Latin, literally 'difference', from different- 'carrying away' (see different).
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Important differentia of incisors, canines, bicuspids and molars include the number of points (cusps) on them. Besides that, they look different and are in different locations in the jaw and stuff like that. Oh, yeah, you know, the same kind of tooth also differs from one animal to another.
