Wordnet 3.0
NOUN (1)
1.
tufted perennial found in shallow water or marshland;
sometimes poisons livestock;
[syn: arrow grass, Triglochin maritima]
The Collaborative International Dictionary of English v.0.48:
Arrow grass \Ar"row grass`\, n. (Bot.)
An herbaceous grasslike plant (Triglochin palustre, and
other species) with pods opening so as to suggest barbed
arrowheads.
[1913 Webster] Arrowhead
WordNet (r) 3.0 (2006):
arrow grass
n 1: tufted perennial found in shallow water or marshland;
sometimes poisons livestock [syn: arrow grass,
Triglochin maritima]