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From The Collaborative International Dictionary of English v.0.48:
Zygospore \Zyg"o*spore\, n. [Gr. zygo`n a yoke + E. spore.] (Bot.) (a) Same as Zygosperm. (b) A spore formed by the union of several zoospores; -- called also zygozoospore. [1913 Webster]