(later Greek ξέστης/xéstēs, 'a sixth'). Roman unit of fluid and dry capacity equalling 1/48 of an amphora , 1/6 of a congius, 2 heminae , 4 quartarii and 12 cyathi (Cyathus ; see table); a sextarius corresponds to approximately 0,546 l. As a measure of volume sextarius also occurs on ancient measuring vessels. Colloquially sextarius was also used for 1/6 of anything. The sextarius was the largest measure of both fluid and dry capacity; higher units had distinct names.
Roman units of fluid and dry capacity and their relationships: sextarius