Lewis & Short

sĭbĭna or sĭbyna, ae, f., = σιβύνη, a kind of hunting-spear, Enn. ap. Paul. ex Fest. p. 336 Müll. (Ann. v. 496 Vahl.); Tert. adv. Marc. 1, 1, as a transl. of [??], Isa. 2, 4 (for which the Vulg. has lanceae).

sĭbyna, ae, v. sibina.