/ Dictionary / Index T trophosome: Meaning and Definition of Find definitions for: troph•o•some Pronunciation: (trof'u-sōm", trō'fu-), [key] — n. Zool. an organ in deep-sea tube worms that is colonized by bacteria supplying the host worm with food and energy. a similar organ in other marine worms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trophoblast trophozoite Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language