/ Dictionary / Index R rice rat: Meaning and Definition of Find definitions for: rice' rat" Pronunciation: [key] any rat of the genus Oryzomys, having an exceptionally long tail, esp. O. palustris, inhabiting rice fields and marshes of the southern U.S., Mexico, and Central America. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ricer ricercar Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language