The Collaborative International Dictionary of English v.0.48:

Convellent \Con*vel"lent\, a. [L. convellens, p. pr. of
   convellere. See Convulse.]
   Tending to tear or pull up. [Obs.]
   [1913 Webster]

         The ends of the fragment . . . will not yield to the
         convellent force.                        --Todd &
                                                  Bowman.
   [1913 Webster]