Cusp

·noun A sharp and rigid point.

II. Cusp ·vt To furnish with a cusp or cusps.

III. Cusp ·noun A prominence or point, especially on the crown of a tooth.

IV. Cusp ·noun The point or horn of the crescent moon or other crescent-shaped luminary.

V. Cusp ·noun The beginning or first entrance of any house in the calculations of nativities, ·etc.

VI. Cusp ·noun A triangular protection from the intrados of an arch, or from an inner curve of tracery.

VII. Cusp ·noun A multiple point of a curve at which two or more branches of the curve have a common tangent.