The Collaborative International Dictionary of English v.0.48:

Beach \Beach\ (b[=e]ch), n.; pl. Beaches (-[e^]z). [Cf. Sw.
   backe hill, Dan. bakke, Icel. bakki hill, bank. Cf. Bank.]
   1. Pebbles, collectively; shingle.
      [1913 Webster]

   2. The shore of the sea, or of a lake, which is washed by the
      waves; especially, a sandy or pebbly shore; the strand.
      [1913 Webster]

   Beach flea (Zool.), the common name of many species of
      amphipod Crustacea, of the family Orchestid[ae], living
      on the sea beaches, and leaping like fleas.

   Beach grass (Bot.), a coarse grass (Ammophila
      arundinacea), growing on the sandy shores of lakes and
      seas, which, by its interlaced running rootstocks, binds
      the sand together, and resists the encroachment of the
      waves.

   Beach wagon, a light open wagon with two or more seats.

   Raised beach, an accumulation of water-worn stones, gravel,
      sand, and other shore deposits, above the present level of
      wave action, whether actually raised by elevation of the
      coast, as in Norway, or left by the receding waters, as in
      many lake and river regions.
      [1913 Webster]

WordNet (r) 3.0 (2006):

beach grass
    n 1: tough grasses with strong roots that can grow on exposed
         sandy shores