quadrans

from The Collaborative International Dictionary of English v.0.48

Quadrans \Quad"rans\, n.; pl. {Quadrantes}. [L.]
   1. (Rom. Antiq.) A fourth part of the coin called an as. See
      3d As, 2.
      [1913 Webster]

   2. The fourth of a penny; a farthing. See {Cur}.
      [1913 Webster]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

QUADRANS, civil law. The fourth part of the whole. Hence the heir 
exquadrante; that is to say, the fourth-part of the whole.