Lewis & Short

ac-căno or ac-cĭno, to sing to or with any thing, acc. to Varr. L. L. 6, § 75 Müll., and Diom. p. 425 P.

ac-cĭno, ĕre, v. n. [cano], to sing to any thing, acc. to Diom. p. 425 P.; cf. accano.