Cinquefoil /(?)/

Cinque·foil

Cinquefoil

n.
  1. 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. (Bot.)
  2. An ornamental foliation having five points or cups, used in windows, panels, etc. (Arch.)

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