/ Dictionary / Index T THC: Meaning and Definition of Find definitions for: THC Pronunciation: [key] — Pharm. Pharm. tetrahydrocannabinol. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thc (Thesaurus) Th.B. Th.D. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language