arrowhead

[ar-oh-hed]
noun
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.

Origin:
1350–1400; Middle English arwe he(ve)d; see arrow, head

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World English Dictionary
arrowhead (ˈærəʊˌhɛd)
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

arrowhead

any freshwater plant of the genus Sagittaria, consisting of about 20 species distributed worldwide, having leaves resembling arrowpoints. Arrowhead is a perennial herb with fleshy, or tuberous, roots that grows in shallow lakes, ponds, and streams. The flowers have three rounded petals. The tubers of some North American species were eaten by Indians and were known to early settlers as duck, or swan, potatoes. The most common species in North America is the broad-leaved arrowhead (S. latifolia), introduced by man to improve feeding areas for birds. Leaves of this species vary from arrow-shaped to grasslike. The grass-leaved arrowhead (S. graminea) is found throughout eastern North America. S. sagittifolia, which grows in most of Europe, is cultivated in China for its edible tubers

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
CT scans showed an arrowhead lodged in his left shoulder, which apparently punctured a major artery when it struck.
The arrowhead motif pointing both up and down, is repeated symmetrically throughout the design.
Within each hexagon huddles a group of seven cells clustered into a gray blue arrowhead.
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