ruminate

First attested in 1533; borrowed from Latin rūminātus, perfect active participle of rūminor (“to chew the cud, turn over in the mind”) (see -ate (verb-forming suffix)), from rūmen (“the throat, gullet”) + -ō (verb-forming suffix), itself of uncertain origin.

First attested in 1800, in the writings of John Hull; borrowed from Latin rūminātus, see Etymology 1 and -ate (adjective-forming suffix).