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a combining form meaning “lung,” used in the formation of compound words:
Also, pneumo-; especially before a vowel, pneumon-.
Origin of pneumono-
combining form representing Greek pneúmōn lung Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Word Origin and History for pneumono-

before vowels pneumon-, word-forming element meaning "lung," from comb. form of Greek pneumon (genitive pneumonos "lung" (see pneumonia).

Online Etymology Dictionary, © 2010 Douglas Harper
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pneumono- in Medicine

pneumono- or pneumon-
Lung; pulmonary: pneumonotomy.

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