(1):

(n.) An ornamental foliation having seven lobes. Cf. Cinquefoil, Quarterfoil, and Trefoil.

(2):

(n.) A typical figure, consisting of seven equal segments of a circle, used to denote the gifts of the Holy Chost, the seven sacraments as recognized by the Roman Catholic Church, etc.

(3):

(n.) A European herb, the tormentil. See Tormentil.