Chem. Also 9 -ine. [f. ETHER + -ENE.] ‘A synonym of ETHYLENE’ (Watts).

1

1850.  Daubeny, Atom. The., v. (ed. 2), 147. Protoxide and peroxide of iron will bear the same relation one to the other, as methylene and etherine do amongst organic compounds.

2

c. 1865.  Letheby, in Wylde’s Circ. Sc., I. 116/1. Etherene (C8 H8), or the volatile gas of Faraday … [is] met with in most of the illuminating gases of commerce.

3