4. (Math.)
Defn: A multiple point of a curve at which two or more branches of the curve have a common tangent.
5. (Anat.)
Defn: A prominence or point, especially on the crown of a tooth.
6. (Bot.)
Defn: A sharp and rigid point.
CUSP
Cusp, v. t. [imp. & p.p. Cusped (kspt); p.pr. & vb. n. Cusping.]
Defn: To furnish with a cusp or cusps.
CUSPATED
Cus"pa*ted (ks"p-td), a.
Defn: Ending in a point.