The Collaborative International Dictionary of English v.0.48:

Maple \Ma"ple\ (m[=a]"p'l), n. [AS. mapolder, mapulder, mapol;
   akin to Icel. m["o]purr; cf. OHG. mazzaltra, mazzoltra, G.
   massholder.] (Bot.)
   A tree of the genus Acer, including about fifty species.
   Acer saccharinum is the rock maple, or sugar maple,
   from the sap of which sugar is made, in the United States, in
   great quantities, by evaporation; the red maple or swamp
   maple is Acer rubrum; the silver maple, Acer
   dasycarpum, having fruit wooly when young; the striped
   maple, Acer Pennsylvanium, called also moosewood. The
   common maple of Europe is Acer campestre, the sycamore
   maple is Acer Pseudo-platanus, and the Norway maple is
   Acer platanoides.
   [1913 Webster]

   Note: Maple is much used adjectively, or as the first part of
         a compound; as, maple tree, maple leaf, etc.
         [1913 Webster]

   Bird's-eye maple, Curled maple, varieties of the wood of
      the rock maple, in which a beautiful lustrous grain is
      produced by the sinuous course of the fibers.

   Maple honey, Maple molasses, Maple syrup, or Maple
   sirup, maple sap boiled to the consistency of molasses.

   Maple sugar, sugar obtained from the sap of the sugar maple
      by evaporation.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Acer campestre
    n 1: shrubby Eurasian maple often used as a hedge [syn: hedge
         maple, field maple, Acer campestre]