Etymology
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oology (n.)

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

updated on August 29, 2019

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Definitions of oology from WordNet

oology (n.)
the branch of zoology that studies eggs (especially birds' eggs and their size, shape, coloration, and number);
From wordnet.princeton.edu, not affiliated with etymonline.