The Collaborative International Dictionary of English v.0.48:

Deraign \De*raign"\, Derain \De*rain"\, v. t. [See Darraign.]
   (Old Law)
   To prove or to refute by proof; to clear (one's self). [Obs.]
   Deraignment

WordNet (r) 3.0 (2006):

Derain
    n 1: French painter and exponent of fauvism (1880-1954) [syn:
         Derain, Andre Derain]