c. 1600, "act of ruminating; act of meditating," from Latin ruminationem (nominative ruminatio) "a chewing the cud," noun of action from past participle stem of ruminare (see ruminate).
ruminants have remarkable powers of rumination
rumble
rumbustious
rumen
ruminant
ruminate
rumination
rummage
rummy
rumor
rumour
rump
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