1. 
   Double-headed
   Dou'ble-head'ed adjective Having two heads; bicipital. Double-headed rail (Railroad) , a rail whose flanges are duplicates, so that when one is worn the other may be turned uppermost.
   Found op http://www.encyclo.co.uk/webster/D/113
   
   
2. 
   Double-headed
   • (a.) Having two heads; bicipital.
   Found op http://thinkexist.com/dictionary/meaning/double-headed/
   
   

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