septfoil

from The Century Dictionary.

• noun A plant, Potentilla Tormentilla. See tormentil.
• noun A figure composed of seven lobes or leaves. Compare cinquefoil, quatrefoil, sexfoil. Specifically A figure of seven equal segments of a circle, used as an ecclesiastical symbol of the seven sacraments, seven gifts of the Holy Spirit, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A European herb, the tormentil. See tormentil.
• noun (Arch.) An ornamental foliation having seven lobes. Cf. Cinquefoil, Quarterfoil, and Trefoil.
• noun (Eccl.Art.), rare 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun architecture a symmetrical shape which forms the overall outline of seven partially-overlapping circles of the same diameter.
• noun heraldry A stylized flower or leaf with seven lobes.