Cinquefoil \Cinque"foil`\, n. [Cinque five + foil, F. feuille leaf. See Foil.]

1. (Bot.) The name of several different species of the genus Potentilla; -- also called five-finger, because of the resemblance of its leaves to the fingers of the hand.

2. (Arch.) An ornamental foliation having five points or cups, used in windows, panels, etc. --Gwilt.

Marsh cinquefoil, the Potentilla palustris, a plant with purple flowers which grows in fresh-water marshes.

Source: Webster's Revised Unabridged Dictionary (1913)