What does the word fog mean?

Usage examples for fog

  1. The night was wrapped in an ocean fog, there was no moon and no stars, but the air was soft and warm. – Sisters by Kathleen Norris
  2. Why did she feel as if some one had placed a hand on her and drawn all her life away, and left her with no emotion or feeling- only a dull, blank, despair, like a cold fog through which no sun shone? – The Wooden Horse by Hugh Walpole
  3. Why won't this miserable fog lift. – The Girl Aviators' Sky Cruise by Margaret Burnham