Cusp -is: a pointed process; sometimes at the margin of a wing.
When the sun is passing from one sign to another, the period is known as a cusp.
There is symmetry about the initial line and a cusp at the origin.
The stealthy boat crept on till midnight; now and then from the cusp of a bay floated out the faint cry of a quail.
The ornaments of the cusp might thus be worked without any troublesome reference to the rest of the arch.
And note that the number of degrees of a sign on the cusp of any house shows that that sign commenced in the previous house.
Posterior upper molar with its fourth cusp little developed; the posterior lower molar four-cusped.
The anterior and median molars have a rudimentary fifth cusp, which is large in the posterior molar.
The third tooth of the series (Fig. 7) has lost one of its cusps; it has lost a cusp of the triangle.
Cusp—an ornament used in the tracery of windows, screens, etc., to form foliation.