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Cusp

kʌsp

Cusp definitions
noun
cusp cusps
  1. a point of transition between two different states

    "those on the cusp of adulthood"

  2. a pointed end where two curves meet
    • a moulded projection at the point of a small arch in Gothic tracery
    • a cone-shaped prominence on the surface of a tooth
    • a pocket or fold in the wall of the heart or a major blood vessel that fills and distends if the blood flows backwards, so forming part of a valve
    • a point at which the direction of a curve is abruptly reversed
    • each of the pointed ends of the crescent moon
    • a sharp rigid point of a leaf
  3. the initial point of an astrological sign or house

    "he was Aries on the cusp with Taurus"