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oocyte
OODA Loop
oodles
OOG
oogamete
oogamy
oogenesis
oogonium
ooh
Ookpik
oolite
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ootid

o·o·tid [ ṓ ə tìd ] (plural o·o·tids)


noun 
Definition:
 
immature egg cell: the stage in the development of an egg cell that becomes the mature ovum immediately prior to fertilization. It is a haploid cell formed by division of the secondary oocyte.

[Early 20th century. <oo-, after spermatid]
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