What does the word shell mean?

Usage examples for shell

  1. How do you suppose that shell got where you found it? – Hidden Gold by Wilder Anthony
  2. Now and then a shell found its mark, but it left us absolutely cold as to its effect on each man at a time like this. – America's War for Humanity by Thomas Herbert Russell
  3. Two shot had already passed through her sail, and a shell had burst so near that possibly some of her crew might have been hit. – The Three Commanders by W.H.G. Kingston