Gerúsia, æ, fœm, gene. A place where the counsell was assembled at Latedcmonia, like as the Senate house was at Rome.
Lewis and Short: Latin dictionary
gĕrūsĭa, ae, f., = gerousi/a, the place of meeting for a council of old men, senatehouse in a Grecian city (= senaculum), Varr. L. L. 5, 32, 156.—II.A public hospital or retreat in Sardes, for old men who had deserved well of their country, Vitr. 4, 8; Plin. 35, 14, 49, 172; Plin. Ep. 10, 42.