the GNU version of the Collaborative International Dictionary of English
n. A white crystalline substance, C6H5.C6H5, obtained by leading benzene through a heated iron tube. It consists of two benzene or phenyl radicals united.
The Century Dictionary and Cyclopedia
n. A colorless compound, C6H5C6H5, found in coal-tar, and prepared by passing benzene vapor through a red-hot tube.