— tachistoscopic /teuh kis'teuh skop"ik/ , adj.
/teuh kis"teuh skohp'/ , 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.
[ 1905-10; táchist ( os ), superl. of tachýs swift + -O- + SCOPE ]