ran·cid

[ran-sid]
adjective
1.
having a rank, unpleasant, stale smell or taste, as through decomposition, especially of fats or oils: rancid butter.
2.
(of an odor or taste) rank, unpleasant, and stale: a rancid smell.
3.
offensive or nasty; disagreeable.

Origin:
1640–50; < Latin rancidus rank, stinking, equivalent to ranc(ēre) to be rotten + -idus -id4

ran·cid·ly, adverb
ran·cid·ness, ran·cid·i·ty, noun
un·ran·cid, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Rancid is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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World English Dictionary
rancid (ˈrænsɪd) [Click for IPA pronunciation guide]
 
adj
1.  (of butter, bacon, etc) having an unpleasant stale taste or smell as the result of decomposition
2.  (of a taste or smell) rank or sour; stale
 
[C17: from Latin rancidus rank, from rancēre to stink]
 
rancidity
 
n
 
'rancidness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

rancid
1646, from L. rancidus "rank, stinking, offensive," from rancere "be spoiled or rotten," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

rancid ran·cid (rān'sĭd)
adj.
Having the disagreeable odor or taste of decomposing oils or fats.


ran·cid'i·ty or ran'cid·ness n.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The sickly sweet odor of rancid juice boxes, stacked in waist-high bales, made a visitor's eyes water.
Regular corn meal is a whole ground corn meal that is full fat and can become rancid because of the high oil content.
There was a strong smell of coffee grounds, a stink of rancid meat.
When the water was finally gone, every tool, machine and surface was bathed in
  a toxic mix of used motor oil and rancid mud.
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