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oro-1

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  1. a combining form meaning “mountain,” used in the formation of compound words: orography.

Origin of oro-1

< Greek, combining form of óros

oro-2

  1. a combining form meaning “mouth,” used in the formation of compound words: oropharynx.

Origin of oro-2

combining form representing Latin ōs, stem ōr-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for oro-

oro-1

combining form
  1. mountainorogeny; orography

Word Origin

from Greek oros

oro-2

combining form
  1. oral; mouthoromaxillary

Word Origin

from Latin, from ōs
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

Word Origin and History for oro-

word-forming element meaning "mountain," from Greek oros "mountain" (see oread).

Online Etymology Dictionary, © 2010 Douglas Harper

oro- in Medicine

oro-

pref.
  1. Mouth:oronasal.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.