The Collaborative International Dictionary of English v.0.48:

Geniculate \Ge*nic"u*late\, a. [L. geniculatus, fr. geniculum
   little knee, knot or joint, dim. of genu knee. See Knee.]
   Bent abruptly at an angle, like the knee when bent; as, a
   geniculate stem; a geniculate ganglion; a geniculate twin
   crystal.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Geniculate \Ge*nic"u*late\, v. t. [imp. & p. p. Geniculated;
   p. pr. & vb. n. Geniculating.]
   To form joints or knots on. [R.] --Cockeram.
   [1913 Webster]

WordNet (r) 3.0 (2006):

geniculate
    adj 1: bent at a sharp angle