(mathematics) A kind of modular form with a zero constant coefficient in the Fourier series expansion.

(chiefly US) A spittoon.

A tooth with a single cusp; a canine tooth.

A person considered to have been born on a cusp between significant generations. / (astrology) A person born on a day at a junction of star signs.

plural of cusper

plural of cuspid

Having a cusp / (botany, of a leaf) Tapering to a sharp, firm point

Without a cusp or cusps.

Having cusps.

The condition of being cuspy / (astronomy) A measure of the chaos on the surface of a star