a combining form meaning “arm,” “upper arm,” used in the formation of compound words: brachiopod.
Also especially before a vowel, brachi-.
Origin of brachio-
combining form representing Latin brāchium and Greek brachī́ōn
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for brachio-
before a vowel brachi-
indicating a brachiumbrachiopod
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 brachio-
before a vowel, brachi-, word-forming element meaning "arm," from Greek brakhion "arm," perhaps originally "upper arm," literally "shorter," and from brakhys "short" (see brief (adj.)), in contrast to the longer forearm.
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for brachio-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.