Acuminate

Part of speech: verb (v.)

To render sharp or keen. [R.] "To acuminate even despair." Cowper.

Part of speech: verb (v.)

To end in, or come to, a sharp point. "Acuminating in a cone of prelacy." Milton.

Part of speech: adjective (a.)

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