a combining form meaning “air,” “breath,” “spirit,” used in the formation of compound words: pneumatology; pneumatophore.
Also, pneumo-; especially before a vowel, pneumat-.

< Greek, combining form of pneûma; see pneuma Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
combining form
air; breath or breathing; spirit: pneumatophore; pneumatology
[from Greek pneuma, pneumat-, breath; see pneuma]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pneumato- or pneumat-

  1. Air; gas: pneumatocardia.

  2. Breath; respiration: pneumatograph.

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