D defs.my
Entry 2 senses Webster, 1913

Lancet

/lăn'-sət/ · Lan·cet · IPA /ˈlæn.sɪt/
01 n. A surgical knife-like instrument of various forms, commonly sharp-pointed and two-edged, used in venesection, and in opening abscesses, etc.
  1. 1.
    A surgical knife-like instrument of various forms, commonly sharp-pointed and two-edged, used in venesection, and in opening abscesses, etc.
  2. 2.
    An iron bar used for tapping a melting furnace.(Metal.)
Phrases & compounds
Lancet arch — a pointed arch, of which the width, or span, is narrow compared with the height.
Lancet architecture — a name given to a style of architecture, in which lancet arches are common; -- peculiar to England and 13th century.