transubstantiation

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tran·sub·stan·ti·a·tion / ˌtransəbˌstanchēˈāshən/ • n. Christian Theol. (esp. in the Roman Catholic Church) the conversion of the substance of the Eucharistic elements into the body and blood of Christ at consecration, only the appearances of bread and wine still remaining. ∎ formal a change in the form or substance of something.

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