/ Dictionary / Index M mother superior: Meaning and Definition of Find definitions for: moth'er supe'rior Pronunciation: [key] — pl. mother superiors, mothers superior. the head of a Christian religious community for women. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mother spleenwort mother tongue Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language