Ge·hen·na /gɪˈhɛnə/
  欣嫩子谷,焦熱地獄,地獄
  Ge·hen·na prop. n.  Jewish Hist. The valley of Hinnom, near Jerusalem, where some of the Israelites sacrificed their children to Moloch, which, on this account, was afterward regarded as a place of abomination, and made a receptacle for all the refuse of the city, perpetual fires being kept up in order to prevent pestilential effluvia.  In the New Testament the name is transferred, by an easy metaphor, to Hell.
  The pleasant valley of Hinnom.  Tophet thence
  And black Gehenna called, the type of Hell.   --Milton.
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  Gehenna
       n : a place where the wicked are punished after death [syn: Tartarus]
  Gehenna
     (originally Ge bene Hinnom; i.e., "the valley of the sons of
     Hinnom"), a deep, narrow glen to the south of Jerusalem, where
     the idolatrous Jews offered their children in sacrifice to
     Molech (2 Chr. 28:3; 33:6; Jer. 7:31; 19:2-6). This valley
     afterwards became the common receptacle for all the refuse of
     the city. Here the dead bodies of animals and of criminals, and
     all kinds of filth, were cast and consumed by fire kept always
     burning. It thus in process of time became the image of the
     place of everlasting destruction. In this sense it is used by
     our Lord in Matt. 5:22, 29, 30; 10:28; 18:9; 23:15, 33; Mark
     9:43, 45, 47; Luke 12:5. In these passages, and also in James
     3:6, the word is uniformly rendered "hell," the Revised Version
     placing "Gehenna" in the margin. (See HELL; HINNOM.)