Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

Source : WordNet®

geniculate
     adj : bent at a sharp angle