The Collaborative International Dictionary of English v.0.48:

Dissect \Dis*sect"\, v. t. [imp. & p. p. Dissected; p. pr. &
   vb. n. Dissecting.] [L. dissectus, p. p. of dissecare; dis-
   + secare to cut. See Section.]
   1. (Anat.) To divide into separate parts; to cut in pieces;
      to separate and expose the parts of, as an animal or a
      plant, for examination and to show their structure and
      relations; to anatomize.
      [1913 Webster]

   2. To analyze, for the purposes of science or criticism; to
      divide and examine minutely.
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            This paragraph . . . I have dissected for a sample.
                                                  --Atterbury.
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The Collaborative International Dictionary of English v.0.48:

Dissected \Dis*sect"ed\, a.
   1. Cut into several parts; divided into sections; as, a
      dissected map.
      [1913 Webster]

   2. (Bot.) Cut deeply into many lobes or divisions; as, a
      dissected leaf.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dissected
    adj 1: having one or more incisions reaching nearly to the
           midrib [syn: cleft, dissected]