TETRAMETHYLENE

Tet `ra *meth "yl *ene, n. Etym: [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.