crustum, i, n. [access. form to crusta],
pastry, any thing baked , Hor. Ep. 1, 1, 78; Verg. A. 7, 115; Inscr. Grut. 173, 4; 373, 8.
crūstum ī, n CRV-, a hard loaf, cake, pastry : Crustis viduas venari, H.: fatale, V. ...
An Elementary Latin Dictionary