Entry 1 sense Webster, 1913 Carbanil · Car·ba·nil · IPA 01 n. A mobile liquid, CO.N.C6H5, of pungent odor. It is the phenyl salt of isocyanic acid. 1. A mobile liquid, CO.N.C6H5, of pungent odor. It is the phenyl salt of isocyanic acid.(Chem.)