/ Dictionary / Index F fissirostral: Meaning and Definition of Find definitions for: fis•si•ros•tral Pronunciation: (fis"u-ros'trul), [key] — adj. Ornith. having a broad, deeply cleft beak or bill, as the swallows and goatsuckers. (of the bill) deeply cleft. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fissiped fissure Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language