a combining form meaning “arm,” “upper arm,” used in the formation of compound words: brachiopod.
Also, especially before a vowel, brachi-.

combining form representing Latin brāchium and Greek brachī́ōn Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brachio- or (before a vowel) brachi-
combining form
indicating a brachium: brachiopod
brachi- or (before a vowel) brachi-
combining form

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

before a vowel, brachi-, comb. form meaning "arm," from Gk. brakhion "arm," perhaps originally "upper arm," lit. "shorter," and from brakhys "short," in contrast to the longer forearm (see brief (adj.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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