Definition of transubstantiation noun from the Oxford Advanced American Dictionary

 

transubstantiation

 noun
noun
NAmE//ˌtrænsəbˌstænʃiˈeɪʃn//
 
[uncountable]
 
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the belief that the bread and wine of the communion service become the actual body and blood of Jesus Christ after they have been blessed, even though they still look like bread and wine
See the Oxford Advanced Learner's Dictionary entry: transubstantiation