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rancid (adj.)

1640s, from Latin rancidus "rank, stinking, offensive" (also source of Italian rancido, Spanish rancio), from rancere "be spoiled or rotten," of unknown origin. German ranzig is from French rancide. Related: Rancidness.

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Definitions of rancid from WordNet

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