cusps

noun

1. 1

   A sharp point or pointed end.

2. 2

   An important moment when a decision is made that will determine future events.

3. 3

   A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.

4. 4

   A point made by the intersection of two curved lines or curved structures, a common motif in Gothic architecture.

5. 5

   A boundary between zodiacal signs and houses.

6. 6

   Any of the pointed parts of a canine tooth or molar.

7. 7

   A flap of a valve of a heart or blood vessel.