γερούσιος

α, ον, τό
A. for or befitting the γέροντες, γ. οἶνος wine drunk only by the chiefs, Il. 4.259, Od. 13.8; γ. ὅρκος an oath taken by them, Il. 22.119; γερούσιον,τό, perquisite of chiefs, Hsch.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project