dibenzanthracene
noun
di·benz·an·thra·cene
variants:
or 1,2:5,6-dibenzanthracene \ (ˌwən-ˌtü-ˌfīv-ˌsiks-)dī-ˌben-ˈzan(t)-thrə-ˌsēn 
\
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Medical Definition of dibenzanthracene
: an orange-brown crystalline actively carcinogenic cyclic hydrocarbon C22H14 found in trace amounts in coal tar