The Collaborative International Dictionary of English v.0.48:

Constipate \Con"sti*pate\, v. t. [imp. & p. p. Constipated; p.
   pr. & vb. n. Constipating.] [L. constipatus, p. p. of
   constipare; con- + stipare to crowd together. See Costive.]
   1. To crowd or cram into a narrow compass; to press together
      or condense. [Obs.]
      [1913 Webster]

            Of cold the property is to condense and constipate.
                                                  --Bacon.
      [1913 Webster]

   2. To stop (a channel) by filling it, and preventing passage
      through it; as, to constipate the capillary vessels.
      [1913 Webster]

   3. (Med.) To render costive; to cause constipation in.
      [1913 Webster]

WordNet (r) 3.0 (2006):

constipate
    v 1: impede with a clog or as if with a clog; "The market is
         being clogged by these operations"; "My mind is constipated
         today" [syn: clog, constipate]
    2: cause to be constipated; "These foods tend to constipate you"
       [syn: constipate, bind]