tachism

noun

tach·​ism ˈta-ˌshi-zəm 

often capitalized

: action painting

tachist

ˈta-shist 

adjective or noun

or less commonly tachiste

ta-ˈshēst 

often capitalized

Word History

Etymology

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

First Known Use

1955, in the meaning defined above