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 (taˌchistoˈscopically)
adverb
Word origin
C20: from Greek takhistos swiftest (see tachy-) + -scope
tachistoscope in American English
(təˈkɪstəˌskoʊp)
noun
an apparatus that exposes words, pictures, etc. for a measured fraction of a second, used to increase reading speed or to test memory, perception, etc.