ăduncĭtas, ātis, f. [aduncus],
the curvature of a point inwards , hookedness , aduncity : rostrorum, * Cic. N. D. 2, 47, 122; so, rostri, Plin. 8, 27, 41, § 97; 10, 71, 91, § 196.
aduncitās ātis, f aduncus, hookedness : rostrorum. ...
An Elementary Latin Dictionary