adjective (a)

• enclosed in a protective covering; sometimes used in combination(adj.all)

  Example:
  His sheathed sword.
  The cat's sheathed claws.
  A ship's bottom sheathed in copper.
  Copper-sheathed.
  

  Antonym:
  bare, unsheathed
  

  source: wordnet30
• Povided with, or inclosed in, sheath.(adjective)

  source: webster1913