1. A surgical instrument of various forms, commonly sharp-pointed and two-edged, used in venesection, and in opening abscesses, etc.
2. (Science: chemistry) An iron bar used for tapping a melting furnace. Lancet arch a large, voracious, deep-sea fish (Alepidosaurus ferox), having long, sharp, lancetlike teeth. The doctor, or surgeon fish.
Origin: f. Lancette, dim. Of lance lance. See lance.