One of the mysteries of the English language finally explained.
Originally: a node or joint (in the stem of a plant, the antenna of an arthropod, etc.). In later use also: a feature resembling a bent knee (in an animal, plant, shell, etc.); an angle in a structure, or a feature situated at such an angle.
Early 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. Partly (i) from classical Latin geniculum knee, small knee, knot or joint in the stem of a plant from genū + -culum;.
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