leatherhead

noun3

1. •
   (slang) A firefighter.
2. •
   The friarbird.

   • The piping-crows, the laughing-jackasses, the odd leatherheads, and the coach-wheel birds, all gave us their old music, and brought back pleasant memories of travel. — 1855
3. •
   (slang, no longer used) A city watchman who wore a leather helmet.