One of the mysteries of the English language finally explained.
1Alchemy. The process of transforming a substance to a state of redness. Now historical or archaic.
2Chiefly Soil Science. = rubefaction.
Late 16th century; earliest use found in John Lyly (1554–1606), writer and playwright. From post-classical Latin rubification-, rubificatio (in alchemy) process of transforming a substance to a state of redness, reddening or redness of the skin from rubificare + -atio.
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