What does the word thaw mean?

Usage examples for thaw

  1. You must be careful always to wear warm clothing not only in frost but in a Thaw. – Letters of John Keats to His Family and Friends by John Keats
  2. I've always had a reputation for good nature, but it seems to be slipping awa' Jean, like snow in the thaw, Jean,- as the song book says. – Patty Blossom by Carolyn Wells