congius

/K AH0 N JH IY0 IH0 S/
noun
  1. 1

    An ancient Roman unit of volume in liquid measure consisting of six sextarii or one-eighth amphora (about 118 fluid ounces).

  2. 2

    An ancient Roman unit of weight under Vespasian equal to the weight of a congius of water.

Source: https://en.wiktionary.org/wiki/congius