Change (the Eucharist bread and wine) into the body and blood of Christ.
2.
Change or alter in form, appearance, or nature. Synonyms:transform, transmute."She transformed the clay into a beautiful sculpture" , "Transubstantiate one element into another"
... in the Magdalen's tresses lie; Dream hours before her picture, till thy lips Dare to approach her feet, and thou shalt start To find the canvas warm with life, and matter A moment transubstantiate to heaven. ... — The Saint's Tragedy • Charles Kingsley
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