D defs.my
Entry 1 sense Webster, 1913

martel de fer

/mär'-tĕlˌ dē fẽr/ · mar·tel· de fer · IPA
01 A weapon resembling a hammer, often having one side of the head pointed; -- used by horsemen in the Middle Ages to break armor.
  1. 1.
    A weapon resembling a hammer, often having one side of the head pointed; -- used by horsemen in the Middle Ages to break armor.