One of the mysteries of the English language finally explained.
Designating an excretion from the intestines or (rarely) other organ of the belly. Also: designating the intestinal tract; of or relating to the intestinal tract.
Mid 17th century; earliest use found in John Sadler (1615–1674), political theorist and reformer. From post-classical Latin alvinus from classical Latin alvus belly (from the same Indo-European base as ancient Greek αὐλός) + -īnus.
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