ge·nic·u·late /ʤəˈnɪkjələt/
  (a.)彎曲成膝狀的,有膝狀關節的,有節的
  ge·nic·u·late /-lət, ˌlet/ 形容詞
  膝狀的
  Ge·nic·u·late a.  Bent abruptly at an angle, like the knee when bent; as, a geniculate stem; a geniculate ganglion; a geniculate twin crystal.
  Ge·nic·u·late v. t. [imp. & p. p. Geniculated p. pr. & vb. n. Geniculating.] To form joints or knots on. [R.]
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  geniculate
       adj : bent at a sharp angle