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The branch of zoology that deals with eggs, especially birds' eggs.

o′o·log′ic (ō′ə-lŏj′ĭk), o′o·log′i·cal (-ĭ-kəl) adj.
o′o·log′i·cal·ly adv.
o·ol′o·gist n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
The work uses archival footage to tell the story of the underground British Oological Society, an association of bird's-egg collectors.
Multitudes of gulls, fulmars, and eider-ducks, and 'alcas' hovered about the island, screaming and chattering, and evidently in a state of great perturbation at Bruin's oological researches" (Lamont, 1861:85).
That is, the oological record is more diverse than the bone record prior to the early Maastrichtianlate Maastrichtian boundary (Selles et al., 2014).