/ Dictionary / Index B bladder wrack: Meaning and Definition of Find definitions for: blad'der wrack" Pronunciation: [key] a common seaweed, Fucus vesiculosus, found in cold marine waters, having narrow brownish fronds with air-filled vesicles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bladderwrack (Thesaurus) bladderwort bladdery Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language