/ Dictionary / Index T tachistoscope: Meaning and Definition of Find definitions for: ta•chis•to•scope Pronunciation: (tu-kis'tu-skōp"), [key] — n. Psychol. an apparatus for use in exposing visual stimuli, as pictures, letters, or words, for an extremely brief period, used chiefly to assess visual perception or to increase reading speed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tachistoscope (Thesaurus) tachism tacho- 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