WordReference Random House Unabridged Dictionary of American English © 2026
o•ol•o•gy  (ō ol′ə jē),USA pronunciation n. 
  1. Developmental Biology, Biologythe branch of ornithology that studies birds' eggs.
  • 1825–35; oo- + -logy
o•o•log•i•cal  (ō′ə loj′i kəl),USA pronunciation adj.  o•ol′o•gist, n. 


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