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a combining form meaning “arm,” “upper arm,” used in the formation of compound words:
Also, especially before a vowel, brachi-.
Origin of brachio-
combining form representing Latin brāchium and Greek brachī́ōn Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for brachio-


combining form
indicating a brachium: brachiopod
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
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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
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brachio- in Medicine

brachio- pref.
Arm: brachiocephalic.

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