Difform \Dif"form`\, a. [Cf. F. difforme, fr. L. dif- = dis- + forma form. Cf. {Deform}.] Irregular in form; -- opposed to {uniform}; anomalous; hence, unlike; dissimilar; as, to difform corolla, the parts of which do not correspond in size or proportion; difform leaves. [1913 Webster] The unequal refractions of difform rays. --Sir I. Newton. [1913 Webster]