Etymology
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rancid (adj.)

"offensive to the senses, fetid or soured by chemical change, having a tainted small or taste," 1640s, from Latin rancidus "rank, stinking, offensive" (also source of Italian rancido, Spanish rancio), from rancere "be spoiled or rotten," a word of unknown origin. Compare rancor. German ranzig is from French rancide. Related: Rancidness; rancidity.

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Definitions of rancid

rancid (adj.)
(used of decomposing oils or fats) having a rank smell or taste usually due to a chemical change or decomposition;
rancid butter
rancid bacon
rancid (adj.)
smelling of fermentation or staleness;
Synonyms: sour
From wordnet.princeton.edu