Etymology
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Words related to oo-

*awi- 

Proto-Indo-European root meaning "bird." It also might be the source of *wyo, *yyo, Proto-Indo-European words for "egg."

It forms all or part of: auspex; auspices; auspicious; avian; aviary; aviation; aviator; avicide; aviculture; aviform; caviar; cockney; egg (n.); ocarina; oo-; oocyte; oolite; oology; osprey; ostrich; oval; ovary; ovate (adj.); oviform; oviparous; ovoviviparous; ovoid; ovulate; ovulation; ovule; ovum.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit vih, Avestan vish, Latin avis "bird;" Greek aietos "eagle;" Old Church Slavonic aja, Russian jajco, Breton ui, Welsh wy, Greek ōon, Latin ovum, Old Norse egg, Old High German ei, Gothic ada all meaning "egg."

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oocyst (n.)

in biology, "sac or pouch serving as a receptacle for eggs," 1875; see oo- "egg" + cyst.

oocyte (n.)

"an egg mother-cell," 1895, from oo- "egg" + -cyte "cell."

oogenesis (n.)

"formation and development of the ovum," by 1890, from oo- "egg"+ -genesis "birth, origin, creation." Related: Oogenetic.

oolite (n.)

"limestone rock consisting of fine spherical grains of carbonate of lime," 1785, from Modern Latin oolites, from oo- "egg," + Greek lithos "stone" (see litho-). So called because the rock resembles the roe of fish. Related: Oolitic.

oology (n.)

"the study of birds' eggs," 1823, from oo- "egg" + -logy "study of." Related: Oological; oologist.