Sapa, sapæ, f. g. Plin New wine boiled to the thirde parte: If halfe bee consumed, they call it Defrutum. If but one parte then it is called Calœnum. Purpurea sapa.Ouid.
Lewis and Short: Latin dictionary
săpa, ae, f. [cf. Germ. Saft; Engl sap], must or new wine boiled thick, Varr. ap. Non. 551, 23; 551, 18; Col. 12, 19, 1; Plin. 14, 9, 11, 80; 14, 19, 24, 121; Ov. F. 4, 780; Mart. 7, 53, 6; Fest. s. v. burranica, p. 30.