Definition of rancor

< rancid

rancour >

ran·cor    (rngkr) KEY 

NOUN:

Bitter, long-lasting resentment; deep-seated ill will. See Synonyms at enmity.

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ETYMOLOGY:
Middle English, from Old French, from Late Latin, rancid smell, from Latin rancre, to stink, be rotten

OTHER FORMS:
rancor·ous(Adjective), rancor·ous·ly(Adverb), rancor·ous·ness(Noun)