This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Pharmacology A gallon.

n. An ancient Roman measure for liquids, equal to about seven eighths of a U.S. gallon (3.3 liters).

n. An ancient Roman liquid measure, being six sextarii or one eighth of an amphora; also used as a weight measure during the reign of Vespasian, being the weight of that volume of water.

n. A liquid measure containing about three quarts.

n. A gallon, or four quarts.

n. A measure of capacity among the ancient Romans, the eighth part of the amphora.

n. In pharmacy, a gallon.

n. a British imperial capacity measure (liquid or dry) equal to 4 quarts or 4.545 liters

"The new aediles discharged their functions with great munificence; the Roman Games were celebrated on a grand scale considering their resources at the time; they were repeated a second day and a congius of oil was distributed in each street."

imperial capacity unit    british capacity unit   

congii    cong