acuminate

adj. tapering gradually to a point (Botany)

v. sharpen

Verb
1. make sharp or acute; taper; make (something) come to a point
(hypernym) sharpen, taper, point
(derivation) acumen
Adjective
1. of a leaf shape; narrowing to a slender point
(similar) simple, unsubdivided

v. acuminate, sharpen

adj. sharp, pointed

(v. t.)
To render sharp or keen.
  

(v. i.)
To end in, or come to, a sharp point.
  

(a.)
Tapering to a point; pointed; as, acuminate leaves, teeth, etc.
  

adj.
نوکدار (Botany)