KNEE JERK
Knee jerk. (Physiol.)

Defn: A jerk or kick produced by a blow or sudden strain upon the patellar tendon of the knee, which causes a sudden contraction of the quadriceps muscle.

KNEEJOINT
Knee"joint`, n.

1. The joint of the knee.

2. (Mach.)

Defn: A toggle joint; — so called because consisting of two pieces jointed to each other end to end, making an angle like the knee when bent.

KNEEJOINTED
Knee"joint`ed, a. (Bot.)

Defn: Geniculate; kneed. See Kneed, a., 2.

KNEEL
Kneel, v. i. [imp. & p. p. Knelt or Kneeled (p. pr. & vb. n.
Kneeling.] Etym: [OE. knelen, cneolien; akin to D. knielen, Dan.
knæle. See Knee.]

Defn: To bend the knee; to fall or rest on the knees; — sometimes
with down.
And he kneeled down, and cried with a loud voice, Lord, lay not this
sin to their charge. Acts vii. 60.
As soon as you are dressed, kneel and say the Lord's Prayer. Jer.
Taylor.