The Collaborative International Dictionary of English v.0.48:

Disarticulate \Dis`ar*tic"u*late\, v. t.
   To sunder; to separate, as joints. -- Dis`ar*tic`u*la"tion,
   n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disarticulate
    v 1: separate at the joints; "disjoint the chicken before
         cooking it" [syn: disjoint, disarticulate]