The Collaborative International Dictionary of English v.0.48:

Dissever \Dis*sev"er\, v. t. [imp. & p. p. Dissevered; p. pr.
   & vb. n. Dissevering.] [OE. dessevrer; pref. des- (L. dis-)
   + sevrer to sever, F. sevrer to wean, L. separate to
   separate. In this word the prefix is intensive. See Dis-,
   and Sever.]
   To part in two; to sever thoroughly; to sunder; to disunite;
   to separate; to disperse.
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         The storm so dissevered the company . . . that most of
         therm never met again.                   --Sir P.
                                                  Sidney.
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         States disserved, discordant, belligerent. --D.
                                                  Webster.
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