Definify.com

Webster 1913 Edition

(Chem.)

An unsymmetrical, divalent, hydrocarbon radical,

C2H4

metameric with ethylene but written thus,

CH3.CH=

to distinguish it from the symmetrical ethylene,

CH2=CH2

. Its compounds are derived from aldehyde. Formerly called also

ethidene

See also: éthylidène

ethylidene ‎(plural ethylidenes)

(organic chemistry, especially in combination) The divalent radical CH₃-CH= formally obtained by removing two hydrogen atoms from the same carbon atom of ethane