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
Word origin
C18: named from the shape of the fruits when open
Examples of 'arrowgrass' in a sentence
arrowgrass
And sea arrowgrass, which has the flavour of coriander but grows out of rotting seaweed.