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atmo-

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  1. a combining form meaning “air,” used in the formation of compound words: atmosphere.
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Origin of atmo-

< Greek, combining form of atmós vapor, smoke
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for atmo-

atmo-

combining form
  1. air or vapouratmometer; atmosphere
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Word Origin

via New Latin from Greek atmos vapour
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

atmo- in Medicine

atmo-

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