/ Dictionary / Index T thalloid: Meaning and Definition of Find definitions for: thal•loid Pronunciation: (thal'oid), [key] — adj. Bot. resembling or consisting of a thallus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thalloid (Thesaurus) thallium sulfate thallophyte Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language