zygospore[zī′gə spôr′ zig′ə-]
Bot. a thick-walled, resting spore formed by conjugation of two isogametes, as in certain primitive fungi and certain green algae
Origin of zygosporezygo- + spore
A thick-walled diploid or multinucleate spore formed by the union of similar gametes in certain fungi and algae.