The Collaborative International Dictionary of English v.0.48:

Ribwort \Rib"wort`\, n. (Bot.)
   A species of plantain (Plantago lanceolata) with long,
   narrow, ribbed leaves; -- called also rib grass, ripple
   grass, ribwort plantain.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ripple \Rip"ple\, n.
   1. The fretting or dimpling of the surface, as of running
      water; little curling waves.
      [1913 Webster]

   2. A little wave or undulation; a sound such as is made by
      little waves; as, a ripple of laughter.
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   Ripple grass. (Bot.) See Ribwort.

   Ripple marks, a system of parallel ridges on sand, produced
      by wind, by the current of a steam, or by the agitation of
      wind waves; also (Geol.), a system of parallel ridges on
      the surface of a sandstone stratum.
      [1913 Webster]