lancet

Etymology

From Middle English launcet, from Old French lancete, a diminutive of lance .

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. (metallurgy) An iron bar used for tapping a melting furnace.
4. (architecture) A high narrow window, terminating in an arch acutely pointed, often double or triple, common in the first half of the 13th century.
   He looked away, into the cavernous space emptying of people. Up in the galleries and behind the choir, the wide window lancets were sheets of black. 2014, Richard Powers, Orfeo, W. W. Norton & Company, page 234

verb

1. To pierce with a lancet.