The Collaborative International Dictionary of English v.0.48:

Multure \Mul"ture\, n. [OF. multure, moulture, F. mouture, fr.
   L. molitura a grinding, molere to grind. See Mill the
   machine.]
   1. (Scots Law) The toll for grinding grain. --Erskine.
      [1913 Webster]

   2. A grist or grinding; the grain ground.
      [1913 Webster]

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

MULTURE, Scotch law. The quantity of grain or meal payable to the proprietor
of the mill, or to the multurer, his tacksman, for manufacturing the corns.
Ersk. Prin. Laws of Scotl. B. 2 t. 9, n. 19.