Cong

from The Collaborative International Dictionary of English v.0.48
Cong \Cong\, n. (Med.)
   An abbreviation of {Congius}.
   [1913 Webster]
    
from The Collaborative International Dictionary of English v.0.48
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]
    

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