lancet

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Medicine A surgical knife with a short, wide, pointed double-edged blade, used especially for making punctures and small incisions. Also called lance.
2. n. Architecture A lancet arch.
3. n. Architecture A lancet window.

Century Dictionary and Cyclopedia

1. n. A small lance or javelin.
2. n. A small surgical instrument, sharp-pointed and generally two-edged, used in bloodletting and in opening tumors, abscesses, etc. Lancets are known as gum-lancets, vaccinating-lancets, etc., according to their use, and their shapes are various. Ordinary lancets are fixed in a handle somewhat like that of a razor, sometimes three together on a single pin, opening in either direction.
3. n. In arch., a lancet-window; an arch of lancet shape.
4. n. In entomology, one of the lower pair of piercing organs in the dipterous mouth; the scalpella: supposed by Kirby and Spence to represent the maxillæ of the haustellate mouth.

Wiktionary

1. n. A sharp, pointed, two-edged surgical instrument used in venisection and for opening abscesses etc.
2. n. A fleam.

GNU Webster's 1913

1. n. A surgical knife-like instrument of various forms, commonly sharp-pointed and two-edged, used in venesection, and in opening abscesses, etc.
2. n. An iron bar used for tapping a melting furnace.

WordNet 3.0

1. n. an acutely pointed Gothic arch, like a lance
2. n. a surgical knife with a pointed double-edged blade; used for punctures and small incisions