Know how to use "fewer" and "less"? Find out.
late 14c., launcet, from Old French lancette "small lance" (12c.), diminutive of lance (see lance (n.)).
lancet lan·cet (lān'sĭt)n. A surgical knife with a short, wide, pointed double-edged blade, used especially for making punctures and small incisions. Also called lance.