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tetralin

n. (context organic compound English) The bicyclic hydrocarbon 1,2,3,4-tetrahydronaphthalene; it is used as an industrial solvent

Wikipedia
Tetralin

Tetralin (1,2,3,4-tetrahydronaphthalene) is a hydrocarbon having the chemical formula CH. This molecule is similar to the naphthalene chemical structure except that one ring is saturated.