Tetramethylene

• (n.) A hypothetical hydrocarbon, C4H8, analogous to trimethylene, and regarded as the base of well-known series or derivatives. • (n.) Sometimes, an isomeric radical used to designate certain compounds which are really related to butylene.
Found on http://thinkexist.com/dictionary/meaning/tetramethylene/

Tetramethylene

Tet`ra·meth'yl·ene noun [ Tetra- + methylene .] (Chemistry) (a) A hypothetical hydrocarbon, C 4 H 8 , analogous to trimethylene, and regarded as the base of well-known series or derivatives. (b) Sometimes, an isomeric radical used to designat...
Found on http://www.encyclo.co.uk/webster/T/34
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