lancet

What it means

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

   With a lancet, Håkan drained the slow blue blood from his leg, always fearing to find pus.

   2017, Hernan Diaz, In the Distance, Daunt Books (2018), page 248

2. A small, sterile single-use needle used to draw a drop of blood for testing, as with a glucometer.
3. engineeringAn iron bar used for tapping a melting furnace.

In a sentence

With a lancet, Håkan drained the slow blue blood from his leg, always fearing to find pus.

2017, Hernan Diaz, In the Distance, Daunt Books (2018), page 248

Where it comes from

1. Old Frenchlancete
2. Middle Englishlauncet
3. Englishlancet

From Middle English launcet, from Old French lancete, a diminutive of lance. By surface analysis, lance + -et.