mal·form \ˈ ̷ ̷+\transitive verb Etymology:mal- (I) + form, v. : to cause to be badly or imperfectly formed : cause to be formed in such a way as to deviate from the normal or usual : give an abnormal, anomalous, or otherwise irregular and defective formation or structure to < a virus that malforms tobacco leaves > < in his chair sat a personality malformed beyond decency by greed and pride — Clemence Dane >