[zahy-guh-spawr, -spohr, zig-uh-]
noun Botany, Mycology.
a cell formed by fusion of two similar gametes, as in certain algae and fungi.

1860–65; zygo- + -spore

zygosporic [zahy-guh-spawr-ik, -spor-, zig-uh-] , adjective
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World English Dictionary
zygospore (ˈzaɪɡəʊˌspɔː, ˈzɪɡ-)
a thick-walled sexual spore formed from the zygote of some fungi and algae

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American Heritage
Science Dictionary
zygospore   (zī'gə-spôr', zĭg'ə-)  Pronunciation Key 
A large, multinucleate spore formed by union of isogametes (gametes that are not distinguished by size and structure), as in certain algae or fungi. A zygospore develops thick, resistant walls and enters a period of dormancy before germinating.
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