Source : Webster's Revised Unabridged Dictionary (1913)

Peacemaker \Peace"mak`er\, n.
   One who makes peace by reconciling parties that are at
   variance. --Matt. v. 9. --{Peace"mak`ing}, n.

Source : WordNet®

peacemaker
     n 1: someone who tries to bring peace [syn: {conciliator}, {make-peace},
           {pacifier}, {reconciler}]
     2: a belt-fed machine gun capable of firing more than 500
        rounds per minute; used by United States troops in World
        War II and the Korean War [syn: {Browning machine gun}]