Real Dictionary

cinquefoil in American English
any of a genus (Potentilla) of plants of the rose family, with white, yellow, or red flowers and fruit like a dry strawberry: some species have compound leaves with five leaflets arranged like the fingers on a hand
noun: 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

cinquefoil in British English
noun: any plant of the N temperate rosaceous genus Potentilla, typically having five-lobed compound leaves