Definition of oo- in English:

oo-

Syllabification: oo-

combining form

Biology
Relating to or denoting an egg or ovum.

Origin

from Greek ōion 'egg'.

Definition of oo- in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous