Source : Webster's Revised Unabridged Dictionary (1913)

Picket \Pick"et\, v. t. [imp. & p. p. {Picketed}; p. pr. & vb.
   n. {Picketing}.]
   1. To fortify with pointed stakes.

   2. To inclose or fence with pickets or pales.

   3. To tether to, or as to, a picket; as, to picket a horse.

   4. To guard, as a camp or road, by an outlying picket.

   5. To torture by compelling to stand with one foot on a
      pointed stake. [Obs.]