arrowhead

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1. the head or tip of an arrow, usually separable from the shaft and conventionally wedge-shaped.
2. anything resembling or having the conventional shape of an arrowhead.
3. Also called swamp potato. any aquatic or bog plant of the genus Sagittaria, having usually arrowhead-shaped leaves and clusters of white flowers.
4. any of several other plants having arrowhead-shaped leaves.
5. the dartlike form in an egg-and-dart ornament.

noun

1. the pointed tip of an arrow, often removable from the shaft
2. something that resembles the head of an arrow in shape, such as a triangular decoration on garments used to reinforce joins
3. any aquatic herbaceous plant of the genus Sagittaria, esp S. sagittifolia, having arrow-shaped aerial leaves and linear submerged leaves: family Alismataceae

n.

late 15c., from arrow + head (n.). Ancient ones dug up were called elf-arrows (17c.).

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