"Cusping" is a word in ENGLISH

A triangular protection from the intrados of an arch, or from an inner curve of tracery.

To furnish with a cusp or cusps.

A prominence or point, especially on the crown of a tooth.

A sharp and rigid point.

A multiple point of a curve at which two or more branches of the curve have a common tangent.

The beginning or first entrance of any house in the calculations of nativities, etc.

The point or horn of the crescent moon or other crescent-shaped luminary.

of Cusp

One of the canine teeth; -- so called from having but one point or cusp on the crown. See Tooth.

The space between the cusps in Gothic architecture; a rounded or leaflike ornament, in windows, niches, etc. A group of …

One of the curved ends of a crescent; esp., an extremity or cusp of the moon when crescent-shaped.

Having many cusps or points.

A small opening in window tracery, of which the cusps, etc., make the form nearly square.

Having three cusps, or points; tricuspidate; as, a tricuspid molar.