rancid

[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

rancidly, adverb
rancidness, rancidity, noun
unrancid, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rancid (ˈrænsɪd)
 
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
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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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Encyclopedia Britannica
Encyclopedia

rancidity

condition produced by aerial oxidation of unsaturated fat present in foods and other products, marked by unpleasant odour or flavour. When a fatty substance is exposed to air, its unsaturated components are converted into hydroperoxides, which break down into volatile aldehydes, esters, alcohols, ketones, and hydrocarbons, some of which have disagreeable odours. Butter becomes rancid by the foregoing process and by hydrolysis, which liberates volatile and malodorous acids, particularly butyric acid. Saturated fats such as beef tallow are resistant to oxidation and seldom become rancid at ordinary temperatures.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Hydrolytic rancidity was strongly correlated with esterase activity but not
  with oil concentration.
Samples will also be tested by equipment that measures color, microbial
  presence, and rancidity and warm over flavor.
Iron-hydroperoxide interactions will cause the decomposition of fatty acids
  leading to the development of rancidity.
Hydrolytic rancidity found in milk will give off an odor resembling spoiled
  nutmeats.
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