n. (Med.) A condition in which the knees are bent in so as to touch each other in walking; inknee. Syn. -- knock-knees, genu valgum. [ 1913 Webster ]
a. Having the legs bent inward so that the knees touch in walking. [ Written also knack-kneed. ]
n. 1. knock-knee. Syn. -- knock-knee, genu valgum. [ WordNet 1.5 ]