noun.
That which is analogous to, or corresponds with, some other thing.
noun.
A word in one language corresponding with one in another; an analogous term.”
noun.
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noun.
An organ which is equivalent in its functions to a different organ in another species or group, or even in the same group.
noun.
A species in one genus or group having its characters parallel, one by one, with those of another group.
noun.
A species or genus in one country closely related to a species of the same genus, or a genus of the same group, in another: such species are often called representative species, and such genera, representative genera.