Anatomy, Zoology, Botany. a point, projection, or elevation, as on the crown of a tooth.
Also called spinode. Geometry. a point where two branches of a curve meet, end, and are tangent.
Architecture. a decorative device, used especially in Gothic architecture to vary the outlines of intradoses or to form architectural foils, consisting of a pair of curves tangent to the real or imaginary line defining the area decorated and meeting at a point within the area.
Astronomy. a point of a crescent, especially of the moon.
Astrology. a. the zodiacal degree that marks the beginning of a house or a sign. b. Informal. a person born on the first day of a sign.
a point that marks the beginning of a change: on the cusp of a new era.