/ Dictionary / Index M mother spleenwort: Meaning and Definition of Find definitions for: moth'er spleen'wort Pronunciation: [key] a fern, Asplenium bulbiferum, of tropical Africa and Australasia, the fronds often bearing bulbils that sprout into new plants while still attached, grown as an ornamental. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mother ship mother superior 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