What does the word frost mean?

Usage examples for frost

  1. The night was bitterly cold; the fog had been followed by a heavy frost. – Good Luck by L. T. Meade
  2. It was still winter, but the night, though cold and very dark, was fine, and the air was sharp with the beginning frost. – Orley Farm by Anthony Trollope
  3. The sun was just getting in its work on the frost. – The Killer by Stewart Edward White