/ Dictionary / Index R rostral: Meaning and Definition of Find definitions for: ros•tral Pronunciation: (ros'trul), [key] — adj. of or pertaining to a rostrum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rostra rostral column Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language