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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Ar·row grass n. Bot. An herbaceous grasslike plant (Triglochin palustre, and other species) with pods opening so as to suggest barbed arrowheads.
 

From: WordNet (r) 2.0

 arrow grass
      n : tufted perennial found in shallow water or marshland;
          sometimes poisons livestock [syn: Triglochin maritima]