geniculumyoudaoicibaDictYouDict[geniculum 词源字典]
"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 cent.; 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;.[geniculum etymology, geniculum origin, 英语词源]