tach·isme or tach·ism (tăshĭz′əm)
A French school of art originating in the 1950s and characterized by irregular dabs and splotches of color applied haphazardly to the canvas.
[French tachisme, from tache, stain, from Old French teche, mark, of Germanic origin; see deik- in the Appendix of Indo-European roots.]
tachiste, tachist n.
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