From The Collaborative International Dictionary of English v.0.48 [gcide]:
Disprove \Dis*prove"\, v. t. [imp. & p. p. Disproved; p. pr. &
vb. n. Disproving.] [Pref. dis- + prove: cf. OF.
desprover.]
1. To prove to be false or erroneous; to confute; to refute.
[1913 Webster]
That false supposition I advanced in order to
disprove it. --Atterbury.
[1913 Webster]
2. To disallow; to disapprove of. [Obs.] --Stirling.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
disprove
v 1: prove to be false; "The physicist disproved his colleagues'
theories" [syn: disprove, confute] [ant: demonstrate,
establish, prove, shew, show]