The Collaborative International Dictionary
Isogonism
Isogonism \I*sog"o*nism\, n. [Iso- + Gr. ? offspring, generative parts.] (Zo["o]l.) The quality of having similar sexual zooids or gonophores and dissimilar hydrants; -- said of certain hydroids.
Wiktionary
isogonism
n. (context zoology English) The quality of having similar sexual zooids or gonophores and dissimilar hydrants; said of certain hydroids.