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[tuh-kis-tuh-skohp] /təˈkɪs təˌskoʊp/
noun, Psychology.
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.
Origin of tachistoscope
1905-10; < Greek táchist(os), superlative of tachýs swift + -o- + scope
Related forms
[tuh-kis-tuh-skop-ik] /təˌkɪs təˈskɒp ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for tachistoscope


an instrument, used mainly in experiments on perception and memory, for displaying visual images for very brief intervals, usually a fraction of a second
Derived Forms
tachistoscopic (təˌkɪstəˈskɒpɪk) adjective
tachistoscopically, adverb
Word Origin
C20: from Greek takhistos swiftest (see tachy-) + -scope
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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tachistoscope in Medicine

tachistoscope ta·chis·to·scope (tā-kĭs'tə-skōp', tə-)
An apparatus that projects a series of images onto a screen at rapid speed to test visual perception, memory, and learning.

ta·chis'to·scop'ic (-skŏp'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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