What does the word picket mean?

Usage examples for picket

  1. When there was no answer he caught up a rifle, snapped an order to one of the others, and headed off down the picket line. – A Yankee Flier in Italy by Rutherford G. Montgomery
  2. Then they all laughed at the idea of hot salt being good for the toothache, and Picket said: " Devol, do you know that when salt gets hot it will turn into ashes?" – Forty Years a Gambler on the Mississippi by George H. Devol
  3. I'm nearly as light as he is, and when I'm on top the fence I'll pull our friend off the picket and toss him down to you. – The Patchwork Girl of Oz by L. Frank Baum