cusp

From Wiktionary

Pronunciation[change]

Noun[change]

Singular
cusp

Plural
cusps

  1. A cusp is a pointed end.
  2. A point on a tooth is a cusp.
    The cusp on his back tooth had broken.
  3. The point on a crescent is a cusp.
    They could see the cusp of the moon.
  4. When two curved lines meet, they create a cusp.
  5. A cusp is a point from which everything changes.
    The scientist was at the cusp of a great discovery.