a combining form meaning “bird,” used in the formation of compound words: ornithology.
Also especially before a vowel, ornith-.

Origin of ornitho-

combining form representing Greek ornīth- (stem of órnīs) bird
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British Dictionary definitions for ornitho-


before a vowel ornith-

combining form

bird or birdsornithology; ornithomancy; ornithopter; ornithoscopy; ornithosis

Word Origin for ornitho-

from Greek ornis, ornith- bird
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012