What is "homophyly"

Homophyly \Ho*moph"y*ly\, n. [Homo- + Gr. ? a clan.] (Biol.) That form of homology due to common ancestry (phylogenetic homology), in opposition to homomorphy, to which genealogic basis is wanting.
--Haeckel.

n. (context biology archaic English) That form of homology due to common ancestry (phylogenetic homology), in opposition to homomorphy, to which genealogic basis is wanting.