/ Dictionary / Index B bladder kelp: Meaning and Definition of Find definitions for: blad'der kelp" Pronunciation: [key] any of several species of giant kelp bearing prominent flotation bladders. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bladder fern bladdernose Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language