a yellow-white, more or less viscid substance produced by suppuration and found in abscesses, sores, etc., consisting of a liquid plasma in which white blood cells are suspended.

1535–45; < Latin; akin to Greek pýon pus. See pyo-

puslike, adjective

pus, puss.
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World English Dictionary
pus (pʌs)
the yellow or greenish fluid product of inflammation, composed largely of dead leucocytes, exuded plasma, and liquefied tissue cells
[C16: from Latin pūs; related to Greek puon pus]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1392, from L. pus "pus" (related to puter "rotten," see putrid), from PIE *pu- (cf. Skt. puyati "rots, stinks," putih "stinking, foul;" Gk. puon "discharge from a sore," pythein "to cause to rot;" Goth. fuls, O.E. ful "foul"), perhaps originally echoic of a natural exclamation of disgust.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pus (pŭs)
A generally viscous, yellowish-white fluid formed in infected tissue, consisting of white blood cells, cellular debris, and necrotic tissue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pus   (pŭs)  Pronunciation Key 
A thick, yellowish-white liquid that forms in infected body tissues, consisting of white blood cells, dead tissue, and cellular debris.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


thick, opaque, usually yellowish white fluid matter formed in association with inflammation caused by the invasion of the body by infective microorganisms (such as bacteria). It is composed of degenerating leukocytes (white blood cells), tissue debris, and living or dead microorganisms. See inflammation.

Learn more about pus with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
They occur when an infection causes pus and infected material to collect in the
But the swelling remained and the wound continued to ooze pus.
Wolff, however, argued that much of the damage that actinomycosis causes in
  humans is due to pus.
The infection causes pus or fluid to build up behind the eardrum.
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