'acetylenic' originates from 'acetylene', specifically the word 'acetyl', where 'acet-' meant 'vinegar' and '-yl' is a suffix used in organic chemistry.

'acetylene' changed from the French word 'acétylène' and eventually became the modern English word 'acetylene'.

Initially, it meant 'related to acetylene', and this meaning has largely remained the same in modern usage.