Pl. -ii. (L.). 1. Rom. Antiq. A measure for liquids, containing the eighth part of a Roman amphora, or about 7 pints.
1398. Trevisa, Barth De P. R., XIX. cxxviii. (1495), 392. Congius conteyneth sixe Sextarius.
c. 1420. Pallad. on Husb., IV. 108. Ffor greatest treen … vi Congeus or iv of it ymmote.
1600. Holland, Livy, XXV. ii. 546. For every street throughout the citie, was allowed a Congius of oyle.
1821. J. Q. Adams, in Davies, Metr. Syst., III. (1871), 82. There is a standard congius of the age of Vespasian still extant at Rome.
2. Pharm. The pharmaceutical name for a gallon, represented in prescriptions by the letter C.
