/ Dictionary / Index B Boston fern: Meaning and Definition of Find definitions for: Bos'ton fern' Pronunciation: [key] a variety of sword fern, Nephrolepsis exaltata bostoniensis, having long, narrow, drooping fronds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Boston cream pie Bostonian 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