Source : Webster's Revised Unabridged Dictionary (1913)

Docetism \Doc"e*tism\, n. (Eccl. Hist.)
   The doctrine of the Docet[ae].

Source : WordNet®

Docetism
     n : the heretical doctrine (associated with the Gnostics) that
         Jesus had no human body and hissufferings and death on
         the cross were apparent rather than real