• synonyms


  1. a combining form meaning “arm,” “upper arm,” used in the formation of compound words: brachiopod.
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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. 2018

British Dictionary definitions for brachio-


before a vowel brachi-

combining form
  1. indicating a brachiumbrachiopod
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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.

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Online Etymology Dictionary, © 2010 Douglas Harper

brachio- in Medicine


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