Cyclopedia of Biblical, Theological and Ecclesiastical Literature
wine used in the sacrament of the altar; this should be of the pure juice of the grape. The twentieth canon orders it to be "good and wholesome." Tent-wine is ordinarily used in England, as being more appropriate in its symbolism; but light-colored wine is not uncommonly adopted. Claret, wanting in some particulars the true nature of wine, is forbidden by several Western decrees. (See WINE).
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McClintock, John. Strong, James. Entry for 'Altar-Wine'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/a/altar-wine.html. Harper & Brothers. New York. 1870.