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Acetabulum was a Roman measure of capacity, both fluid and dry, equivalent to the Greek ὀξύβαφον (oxubaphon) and equal to about 66.375 milliliters in volume. It was one fourth of the hemina (equal to about 265.5 milliliters), and one eighth of the sextarius (which was about 567 milliliters).

The measurement unit contained the weight in water of fifteen Attic drachmae (Plinius, Historia Naturalis XXI.109 writes: cum acetabuli mensura dicitur, significat heminae quartam, id est drachmas XV. minima, quam nostri minam vocant, pendet drachmas Atticas C (When the measure of an acetabulum is spoken of, it is the same as one fourth part of a hemina, or fifteen drachmæ in weight. The Greek mna, or, as we more generally call it, "mina," equals one hundred Attic drachmæ in weight))