Wordnet 3.0
NOUN (1)
1.
the heretical doctrine (associated with the Gnostics) that Jesus had no human body and his sufferings and death on the cross were apparent rather than real;
The Collaborative International Dictionary of English v.0.48:
Docetism \Doc"e*tism\, n. (Eccl. Hist.)
The doctrine of the Docet[ae].
[1913 Webster]
WordNet (r) 3.0 (2006):
Docetism
n 1: the heretical doctrine (associated with the Gnostics) that
Jesus had no human body and his sufferings and death on the
cross were apparent rather than real