(1):
(n.) A multiple point of a curve at which two or more branches of the curve have a common tangent.
(2):
(v. t.) To furnish with a cusp or cusps.
(3):
(n.) A prominence or point, especially on the crown of a tooth.
(4):
(n.) A triangular protection from the intrados of an arch, or from an inner curve of tracery.
(5):
(n.) A sharp and rigid point.
(6):
(n.) The beginning or first entrance of any house in the calculations of nativities, etc.
(7):
(n.) The point or horn of the crescent moon or other crescent-shaped luminary.