ketene

[ kee-teen ]
/ ˈki tin /

noun Chemistry.

a colorless, poisonous gas, C2H2O, irritating to the lungs, prepared from acetone or acetic acid by pyrolysis: used chiefly in the manufacture of certain commercial chemicals, as acetic anhydride and aspirin.

Origin of ketene

First recorded in 1905–10; ket- + -ene

British Dictionary definitions for ketene

ketene
/ (ˈkiːtiːn, ˈkɛt-) /

noun

a colourless irritating toxic gas used as an acetylating agent in organic synthesis. Formula: CH 2 :CO Also called: ethonone