What does the word warder mean?

Usage examples for warder

  1. I'm but your warder. – Helmet of Navarre by Bertha Runkle
  2. Each day he was escorted by a warder to a tiny square, walled off in the exercising ground, and was allowed to walk for a few minutes; he would take this opportunity of begging the warder to get the doctor for his friend. – The Autobiography of a Slander by Edna Lyall