Lewis Short
obsōnĭum | ops- (noun N) = ὀψώνιον: or
* That which is eaten with bread; victuals, viands, esp. fish: tu facito obsonatum nobis sit opulentum obsonium,Plaut. Bacch. 1, 1, 64: curare,id. Merc. 3, 3, 22: obsonare,id. Stich. 3, 1, 36: scindere,Sen. Vit. Beat. 17, 2; Plin. 31, 7, 41, § 87: coëmere,Hor. S. 1, 2, 9: opsonia rancidula,Juv. 11, 134.—Also of fruit, Plin. 15, 19, 21, § 82.
Charlton T. Lewis, Charles Short, A Latin Dictionary