Dictionary.net

the bivalent radical CH2 derived from methane

the bivalent radical CH2 derived from methane

A hydrocarbon radical, CH2, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; - formerly called also methene.

A hydrocarbon radical, CH2, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; - formerly called also methene.

A hydrocarbon, CH2, occurring in numerous combinations, but never alone.