rancid
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adjective
(of foods containing fat or oil) smelling or tasting unpleasant as a result of being old and stale:
〈油･脂肪を含む食品が〉いやな臭い［味］がする, くさい
e.g. rancid meat
e.g. without preservatives, fat goes rancid.
DERIVATIVES
rancidity |ranˈsidətē| noun
rancidly adverb
rancidness noun
ORIGIN
early 17th century: from Latin rancidus ‘stinking’.