One of the mysteries of the English language finally explained.
Medicine and Pathology. Originally: †a bruise or other black and blue mark on the skin (obsolete). In later use: black and blue, bluish-grey, or purplish discoloration of the skin; specifically such discoloration occurring in the dependent parts of a dead body; an instance of this.
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From classical Latin līvor bluish discoloration, envy, spite, malice from līvēre to be livid + -or.
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