The Collaborative International Dictionary of English v.0.48:

Septfoil \Sept"foil\, n. [F. sept seven (L. septem) + E. foil
   leaf: cf. L. septifolium.]
   1. (Bot.) A European herb, the tormentil. See Tormentil.
      [1913 Webster]

   2. (Arch.) An ornamental foliation having seven lobes. Cf.
      Cinquefoil, Quarterfoil, and Trefoil.
      [1913 Webster]

   3. (Eccl.Art.) 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. [R.]
      [1913 Webster]