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