What does the word ironclad mean?

Usage examples for ironclad

  1. There was also an ironclad called the Richmond, and two or three smaller craft. – Three Months in the Southern States, April-June 1863 by Arthur J. L. (Lieut.-Col.) Fremantle
  2. Then, to give the yachts time to overtake them, they steamed over to a mighty ironclad that lay at anchor there; and as they came near her vast black bulk they lowered their flag, and the band played " Rule, Britannia." – Macleod of Dare by William Black
  3. He is a grim- visaged brute and built for battle like an ironclad. – Seeds of Pine by Janey Canuck