Redan
Pronunciation : Re*dan" (r*dn")
Part of Speech : n.
Etymology : [F., for OF. redent a double notching or jagging, as in the teeth of a saw, fr. L. pref. re- re- + dens, dentis, a tooth. Cf. Redented.] [Written sometimes redent and redens.]
Definition : 1. (Fort.)
Defn: A work having two parapets whose faces unite so as to form a salient angle toward the enemy.
2. A step or vertical offset in a wall on uneven ground, to keep the parts level.
Source : Webster's Unabridged Dictionary, 1913