lancets

noun

1. A sharp, pointed, two-edged surgical instrument used in venesection and for opening abscesses etc.

2. A small, sterile single-use needle used to draw a drop of blood for testing, as with a glucometer.

3. An iron bar used for tapping a melting furnace.

4. A high narrow window, terminating in an arch acutely pointed, often double or triple, common in the first half of the 13th century.