/ Dictionary / Index T terahertz: Meaning and Definition of Find definitions for: ter•a•hertz Pronunciation: (ter'u-hûrts"), [key] — pl. -hertz, -hertz•es. one trillion (10) hertz. Abbr: THz Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: terahertz (Thesaurus) Terah Terai Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language