binotonous,a.|baɪˈnɒtənəs| [f. L. bīnī(see bin-) + ton-us, Gr. τόν-ος tone + -ous; ? after monotonous.] Consisting of two tones or notes. 1802G. Montagu Ornith.Dict. (L.) During the breeding season their [the Lesser Pettychaps] binotonous cry is incessant.1847in Craig.