That which is corresponding
, as in part of one animal
to a similar part in another animal
: The foreleg
of a horse
and the wing
of a bird
In genetics, it has the specific meaning of sequence identity(origin) and conservation of function(structure). Unfortunately, different people may divide up the genes slightly differently, so it can cause arguments.
This is especially problematic in the rare occasions where convergent evolution occurs. Since the structure is the same, but the origin is not, it could be argued that they are analogs instead.