Also, especially British, rancour.
Origin: 1175–1225; ME
rancour < MF < LL
rancōr- (s. of
rancor) rancidity, equiv. to L
ranc(
ēre) (
see rancid ) +
-ōr- -or 1 
Related forms: rancored; especially British, rancoured, adjective
Synonyms:bitterness, spite, venom, animosity.
See malevolence. Antonyms:
benevolence.