controvert
Cross references:
1. disprove
con.tro.vert \'ka:n-tr*-.v*rt, .ka:n-tr*-'\ \-*r\ \-*-b*l\ vb [controversy]
: to dispute or oppose by reasoning : DENY, CONTRADICT {(R@ a point in a
discussion} : to engage in controversy - con.tro.vert.er n
Webster's English Dictionary