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The fermented juice of the grape, used in the Mass and changed by the words of consecration into the blood of Christ. According to the Church's legislation, "The wine used to celebrate the Eucharist must be made from the fruit of the vine (Luke 22:18), natural and pure, unmixed with anything else . . . The wine must not be allowed to go sour" (Ordo Missae, April 6, 1969, numbers 284, 286).
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.