D defs.my
Entry 2 senses Webster, 1913

Redan

/(r?*d?n")/ · Re·dan · IPA /ɹɪˈdan/
01 n. A work having two parapets whose faces unite so as to form a salient angle toward the enemy.
  1. 1.
    A work having two parapets whose faces unite so as to form a salient angle toward the enemy.(Fort.)
  2. 2.
    A step or vertical offset in a wall on uneven ground, to keep the parts level.