transubstantiation
Concise Oxford English Dictionary © 2008 Oxford University Press:
transubstantiation/transəbstanʃiˈeɪʃn/
▶noun Christian Theology the doctrine that the substance of the Eucharistic elements is converted into the body and blood of Christ at consecration, only the appearances of bread and wine still remaining. Compare with consubstantiation.
'transubstantiation' also found in these Oxford entries:

