Lewis & Short

gĭgērĭa, ōrum, n., the cooked entrails of poultry: gigeria intestina gallinarum cum hisetica (perh. hepatica, al. isiciis) cocta. Lucilius, lib. VIII.: gigeria sunt sive adeo hepatia, Non. 119, 20 sq.: gigeria optime facta, Petr. 66: pullorum coquere, Apic. 4, 2 med.
Note: The explanation in Paul. ex Fest. p. 95 Müll., gigeria ex multis obsoniis decerpta, is evidently corrupt.