tachist\ˈta-shist \ or less commonly tachiste\ta-ˈshēst \adjective or noun, often capitalized
First Known Use of tachism
1955, in the meaning defined above
History and Etymology for tachism
French tachisme, from tache stain, spot, blob, from Old French teche, tache, of Germanic origin; akin to Old Saxon tēkan sign, Old High German zeihhan — more at token entry 1