R / rancor
noun

rancor

gen. rancōris · gender masculine · decl. 3rd
ranceo, rancens.
a stinking smell; rankness; rancidity
Lit., a stinking smell or flavor, rankness, rancidity (late Lat.), Pall. 1, 20, 2; 11, 10, 2. —
an old grudge figuratively
Trop., an old grudge, rancor, Hier. Ep. 13, 1.