noun Cell Biology.
either of a pair of conjugating gametes differing in form, size, structure, or sex.
Origin of heterogamete
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Either of two conjugating gametes that differ in structure or behavior, such as the small motile male spermatozoon and the larger nonmotile female ovum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.