What is "dibenzothiophene"

n. (context organic compound English) The tricyclic heterocycle in which two benzene rings are fused to that of thiophene; any of its derivatives, especially those that occur in crude oil

Dibenzothiophene (DBT) is the organosulfur compound consisting of two benzene rings fused to a central thiophene ring. It is a colourless solid that is chemically somewhat similar to anthracene. This tricyclic heterocycle, and especially its alkyl substituted derivatives, occur widely in heavier fractions of petroleum.