The Collaborative International Dictionary of English v.0.48:

Moraine \Mo*raine"\, n. [F. Cf. Prov. G. mur stones broken off,
   It. mora a heap of stones, hillock, G. m["u]rbe soft, broken
   up, OHG. muruwi, AS. mearu tender, Gr. ? to cause to wither,
   Skr. ml[=a] to relax.] (Geol.)
   An accumulation of earth and stones carried forward and
   deposited by a glacier. --Lyell.
   [1913 Webster]

   Note: If the moraine is at the extremity of the glacier it is
         a terminal moraine; if at the side, a lateral moraine;
         if parallel to the side on the central portion of the
         glacier, a medial moraine. See Illust. of Glacier. In
         the last case it is formed by the union of the lateral
         moraines of the branches of the glacier. A ground
         moraine is one beneath the mass of ice.
         [1913 Webster]

WordNet (r) 3.0 (2006):

moraine
    n 1: accumulated earth and stones deposited by a glacier