What does the word sheathing mean?

Usage examples for sheathing

  1. Inertron sheathing and all, it was blown into powder. – The Airlords of Han by Philip Francis Nowlan
  2. For the first time those Asiatics who had forgotten Marathon discovered the overwhelming superiority that the sheathing of heavy armour gave the Greek hoplites over the lighter armed Median spearmen. – A Victor of Salamis by William Stearns Davis
  3. The sheathing and false keel were very badly damaged, but it was believed that she was not much injured aft, as she made but little water when once the main wound was dry. – The Life of Captain James Cook by Arthur Kitson