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Webster 1913 Edition

Noun.

[

Tetra-

methylene

(Chem.)

(a)

A hypothetical hydrocarbon,

C4H8

, analogous to trimethylene, and regarded as the base of well-known series or derivatives.

(b)

Sometimes, an isomeric radical used to designate certain compounds which are really related to butylene.

tetramethylene ‎(plural tetramethylenes)

(organic chemistry) A hypothetical hydrocarbon, C₄H₈, analogous to trimethylene, and regarded as the base of well-known series or derivatives.
(chemistry) An isomeric radical used to designate certain compounds which are really related to butylene.