any of several plants belonging to the genus Potentilla, of the rose family, having yellow, red, or white five-petaled flowers, as P. reptans (creeping cinquefoil) of the Old World, or P. argentea (silvery cinquefoil) of North America.
Also called quinquefoil, quintefoil. Architecture. a panellike ornament consisting of five lobes, divided by cusps, radiating from a common center.
Heraldry. a charge in the form of a five-leaved clover.

1375–1425; late Middle English sink foil < Middle French cincfoille < Latin quīnque folia five leaves, translation of Greek pentáphyllon Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cinquefoil (ˈsɪŋkˌfɔɪl)
1.  any plant of the N temperate rosaceous genus Potentilla, typically having five-lobed compound leaves
2.  an ornamental carving in the form of five arcs arranged in a circle and separated by cusps
3.  heraldry a charge representing a five-petalled flower
[C13 sink foil, from Old French cincfoille, from Latin quinquefolium plant with five leaves, translating Greek pentaphullon from pente five + phullon leaf]

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Example sentences
Cinquefoil, a medicinal plant use for toothaches and fevers, and pink elephant heads are common during summer.
Tiny subalpine plants, such as cinquefoil, blossom in joints in the granite and on the leeward side of rocks.
Sub-alpine zones have a higher coverage of tundra shrubs such as blueberry, dwarf birch and shrub cinquefoil.
Sulfur cinquefoil crowds out our native plants and other beneficial plants that animals depend on for food.
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