Crossword Genius

Sperm or ovum (6)

Ross

I believe the answer is:

gamete

(Other definitions for gamete that I've seen before include "Egg-cell" , "Male or female germ cell" , "Egg- or sperm-cell" , "An egg or sperm cell" , "Germ cell in reproduction" .)

I've seen this clue in The Wall Street Journal.
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