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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Hair grass Bot. A grass with very slender leaves or branches; as the Agrostis scabra, and several species of Aira or Deschampsia.
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From: WordNet (r) 2.0

 hair grass
      n : fine-leaved aquatic spike rush; popular as aerator for
          aquariums [syn: needle spike rush, needle rush, slender
           spike rush, Eleocharis acicularis]