dinaphth-
combining form 
or dinaphtho- also dinaphtha-
Etymology: International Scientific Vocabulary di- + naphth- or naphtho- or naphtha- (from naphthalene) 
 : containing two naphthalene nuclei 
< dinaphthazine >
< dinaphthothiophene >
— compare naphth- 2
or dinaphtho- also dinaphtha-
< dinaphthazine >
< dinaphthothiophene >
— compare naphth- 2