verb (used without object), in·ter·grad·ed, in·ter·grad·ing.
Words nearby intergrade
Examples from the Web for intergrade
The two subspecies of the Violet-green Swallow, thalassina and lepida, intergrade in Coahuila.
The subspecies cahooni and compositus of the Brown-throated Wren seem to intergrade in the southern part of the State.
Previously the two kinds were thought not to intergrade and were regarded as two species.Speciation of the Wandering Shrew|James S. Findley
The specimen from Chanquejelve is an intergrade between the two subspecies just mentioned.New Subspecies of the Rodent Baiomys From Central America|Robert L. Packard
For the present it seems best to regard the specimen merely as an intergrade.American Weasels|E. Raymond Hall