Wiktionary:Word of the day/2023/June 15

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Word of the day
for June 15
glacis n
  1. A gentle incline.
    1. (geomorphology) A gentle sloping landform created by the deposition or erosion of material.
    2. (military)
      1. (architecture, also figuratively) A gentle incline in front of a fortification which protects it from cannon fire and exposes attackers to more effective return fire from defenders.
      2. In full glacis plate: the angled armour plate on the front of a tank which protects it from projectiles; also (often nautical), such a plate protecting an opening (for example, on a ship).
    3. (post) A device for sorting mail which slides parcels across a sloped surface.
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