To wash away or cleanse; to remove by washing (archaic or technical).
From Latin 'abluere' (to wash away), combining 'ab-' (away) + 'luere' (to wash). The term entered English medical and technical vocabulary in the 16th-17th centuries but fell out of common use.
Latin 'luere' (to wash) gave us 'ablution,' 'dilute,' 'pollute,' and 'dissolute'—all about washing or dissolving things. Medical Latin was basically washing-and-removing terminology because that's what ancient doctors thought medicine was!
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