noun (n)

• an ornamental sunken panel in a ceiling or dome(noun.artifact)

  Synonym:
  coffer, lacuna
  

  source: wordnet30
• a two-wheeled military vehicle carrying artillery ammunition(noun.artifact)

  source: wordnet30
• a chest to hold ammunition(noun.artifact)

  Synonym:
  ammunition chest
  

  source: wordnet30
• large watertight chamber used for construction under water(noun.artifact)

  Synonym:
  cofferdam, pneumatic caisson
  

  source: wordnet30
• A chest to hold ammunition.(noun)

  source: webster1913