half dollar

from WordNet (r) 3.0 (2006)

half dollar
    n 1: a United States coin worth half of a dollar [syn: {half
         dollar}, {fifty-cent piece}]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

HALF DOLLAR, money. A silver coin of the United States of the value of fifty 
cents. It weighs two hundred and six and one-fourth grains. Of one thousand 
parts, nine hundred are of pure silver, and one hundred of alloy. Act of 
January 18, 1837, S. 8 and 9, 4 Sharsw. cont. of Story's L. U. S. 2523, 4. 
Vide Money.