Cong \Cong\, n. (Med.) An abbreviation of {Congius}. [1913 Webster]
Congius \Con"gi*us\, n. [L.] 1. (Roman Antiq.) A liquid measure containing about three quarts. [1913 Webster] 2. (Med.) A gallon, or four quarts. [Often abbreviated to {cong.}] [1913 Webster]