Lewis Short
cŭcūlus (noun M) : (cŭcŭlus, Auct. Carm. Philom. 35), , Sanscr. ku-, to cry; cf. κωκύω
* A cuckoo, Plin. 18, 26, 66, § 249; as a term of reproach,Plaut. As. 5, 2, 73; id. Ps. 1, 1, 94; esp. of foolish men,id. Trin. 2, 1, 18; and of dilatory husbandmen, who are not through with their pruning until the cuckoo is heard (after the vernal equinox),Plin. 1. 1.; Hor. S. 1, 7, 31; cf. Plin. 18, 26, 66, § 249; Voss ad Verg. G. 2, 403.
Charlton T. Lewis, Charles Short, A Latin Dictionary