The Collaborative International Dictionary of English v.0.48:

Misapprehend \Mis*ap`pre*hend"\, v. t.
   To take in a wrong sense; to misunderstand. --Locke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

misapprehend
    v 1: interpret in the wrong way; "Don't misinterpret my comments
         as criticism"; "She misconstrued my remarks" [syn:
         misconstrue, misinterpret, misconceive,
         misunderstand, misapprehend, be amiss]