Lewis & Short

cybaeus, a, um, adj. [κύπη, κυβή, cupa], pertaining to a kind of merchantship: navis maxima, Cic. Verr. 2, 5, 17, § 44.
Absol.: cybaea, ae, f., a transport or merchant-ship, Cic. Verr. 2, 4, 8, § 17.