Definition of oo- in English:

oo-

Pronunciation: /ˈəʊə/

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 humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music