/ Dictionary / Index T theralite: Meaning and Definition of Find definitions for: the•ra•lite Pronunciation: (thēr'u-līt"), [key] — n. a coarse-grained, phaneritic rock composed of labradorite, nepheline, and augite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Thera therapeutic Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language