stiletto

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A small dagger with a slender, tapering blade.
• noun Something shaped like such a dagger.
• noun A small, sharp-pointed instrument used for making eyelet holes in needlework.

from The Century Dictionary.

• To strike or wound with a stiletto; hence, in general, to stab.
• noun A dagger having a blade slender and narrow, and thick in proportion to its width—that is, triangular, square, etc., in section, instead of flat.
• noun A small sharp-pointed implement used for making eyelet-holes and for similar purposes. Stilettos are of ivory, bone, metal, and other materials.
• noun A beard trimmed into a sharp-pointed form.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To stab or kill with a stiletto.
• noun A kind of dagger with a slender, rounded, and pointed blade.
• noun A pointed instrument for making eyelet holes in embroidery.
• noun obsolete A beard trimmed into a pointed form.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Sharp and narrow like a stiletto.
• noun A short sharp knife or dagger-like weapon intended for stabbing.
• noun A rapier.
• noun An awl.
• noun A woman's shoe with a tall, slender heel (stiletto heel).
• verb To attack or kill with a stiletto (dagger).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a small dagger with a tapered blade