1533, "to turn over in the mind," also "to chew cud" (1547), from L. ruminatus, pp. of ruminare "to chew the cud, turn over in the mind," from rumen (gen. ruminis) "gullet," of uncertain origin.
Main Entry: ru·mi·nate Pronunciation: 'rü-m&-"nAt Function: intransitive verb Inflected Forms: -nat·ed;-nat·ing 1: to chew again what has been chewed slightly and swallowed : chew the cud 2: to engage in contemplation