What does the word leathery mean?

Usage examples for leathery

  1. They kept the same two men season after season,- leathery old range hands with eyes that saw whatever came within their field of vision, and with the gift of silence, which is rare. – Sawtooth Ranch by B. M. Bower
  2. I've got a bit of the muscle they call a heart left in me yet, though it has got rather leathery. – Paul Faber, Surgeon by George MacDonald