[zahy-goh-sis, zi-]
noun Biology.
the union of two gametes; conjugation.

1875–80; < Neo-Latin zygōsis < Greek zýgōsis a yoking. See zygote, -sis

zygose [zahy-gohs, zig-ohs] , adjective
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World English Dictionary
zygosis (zaɪˈɡəʊsɪs, zɪ-)
biology another name for conjugation

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Medical Dictionary

zygosis zy·go·sis (zī-gō'sĭs, zĭ-)
n. pl. zy·go·ses (-sēz)
The union of gametes to form a zygote; conjugation.

The American Heritage® Stedman's Medical Dictionary
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