1a pointed end where two curves meet, in particular.
Architecture a projecting point between small arcs in Gothic tracery.
a cone-shaped prominence on the surface of a tooth, especially of a molar or premolar.
Anatomy a pocket or fold in the wall of the heart or a major blood vessel that fills and distends if the blood flows backward, so forming part of a valve.
Mathematics a point at which the direction of a curve is abruptly reversed.
each of the pointed ends of a crescent, especially of the moon.
2 Astrology the initial point of an astrological sign or house:he was Aries on the cusp with Taurus
3a point of transition between two different states:those on the cusp of adulthood
