Metreta, metrétæ, pen. prod. f. g. Col. Iuuenal. As Dioscorides sayeth, it conteyneth ten congios, that is of our measure 10. galous, and 10. pints, which is 11. galons & a quart. Georgius Agricola saieth it conteyneth. 12. congios, that is 72. Sextarios, and then is it a greater measure, onlesse yee wyll take Sextarius as phisitions doe, for 18, ounces, and not for 24. as Budey doth, whese account I follow.
Lewis and Short: Latin dictionary
mĕtrēta, ae, f., = metrhth/s, an Athenian measure for liquids, containing 12 congii (xo/es) and 144 kotu/lai (3/4 of the Attic medimnus, about 9 gallons English): picis liquidae metreta, Col. 12, 22, 1: se vendidisse navem, metretas quae trecentas tolleret, Plaut. Merc. prol. 75.—II.Transf., a tun, cask, jar: oleum si in metretam novam inditurus eris, Cato, R. R. 100: Hispanae, Mart. 5, 16, 7: olivariae, Col. 12, 47: hic tignum capiti incutit, ille metretam, Juv. 3, 246.