Definition of acetenyl in US English:

acetenyl

noun

Chemistry
rare
  • = ethynyl. Frequently attributive Originally as a formative element in the names of compounds, as "acetenylbenzene".

Origin

Late 19th century; earliest use found in Nature: a weekly journal of science. From French acétényle from acet- and -en- (in acétylène) + -yle -yl.