the.com/lancet

means A small, pointed surgical blade used for making quick, precise incisions or punctures, such as lancing a boil or drawing blood.

from From Old French 'lancette,' a diminutive of 'lance' — literally a 'little lance.' The word rode into English in the medieval period already carrying that image of a small, piercing spear, which is exactly what the instrument's slender, double-edged point resembles. The architectural term 'lancet window' (tall, narrow, pointed at top) borrows the same spear-like silhouette.