The Collaborative International Dictionary of English v.0.48:

Marc \Marc\, n. [F.]
   The refuse matter which remains after the pressure of fruit,
   particularly of grapes.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Marc \Marc\, n. [AS. marc; akin to G. mark, Icel. m["o]rk, perh.
   akin to E. mark a sign. [root]106, 273.] [Written also
   mark.]
   1. A weight of various commodities, esp. of gold and silver,
      used in different European countries. In France and
      Holland it was equal to eight ounces.
      [1913 Webster]

   2. A coin formerly current in England and Scotland, equal to
      thirteen shillings and four pence.
      [1913 Webster]

   3. A German coin and money of account. See Mark.
      [1913 Webster]

WordNet (r) 3.0 (2006):

marc
    n 1: made from residue of grapes or apples after pressing

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

MARC
       MAchine Readable Cataloging [record]