D defs.my
Entry 2 senses Webster, 1913

Breastwork

/(brĕst"wûrk`)/ · Breast·work · IPA
01 n. A defensive work of moderate height, hastily thrown up, of earth or other material.
  1. 1.
    A defensive work of moderate height, hastily thrown up, of earth or other material.(Fort.)
  2. 2.
    A railing on the quarter-deck and forecastle.(Naut.)