arrowgrass
- either of two species, sea arrowgrass (Triglochin maritima) or marsh arrowgrass (T. palustris), of monocotyledonous perennials having long thin fleshy leaves and spikes of inconspicuous flowers
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Word Origin
C18: named from the shape of the fruits when open
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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