The Collaborative International Dictionary of English v.0.48:

Shekel \Shek"el\, n. [Heb. shegel, fr. sh[=a]gal to weigh.]
   1. An ancient weight and coin used by the Jews and by other
      nations of the same stock.
      [1913 Webster]

   Note: A common estimate makes the shekel equal in weight to
         about 130 grains for gold, 224 grains for silver, and
         450 grains for copper, and the approximate values of
         the coins are (gold) $5.00, (silver) 60 cents, and
         (copper half shekel), one and one half cents.
         [1913 Webster]

   2. pl. A jocose term for money.
      [1913 Webster]

WordNet (r) 3.0 (2006):

shekel
    n 1: the basic unit of money in Israel