Source : Webster's Revised Unabridged Dictionary (1913)

   2. The central part or point of anything; the middle.

            Within the navel of this hideous wood, Immured in
            cypress shades, a sorcerer dwells.    --Milton.

   3. (Gun.) An eye on the under side of a carronade for
      securing it to a carriage.

   {Navel gall}, a bruise on the top of the chine of the back of
      a horse, behind the saddle. --Johnson.

   {Navel point}. (Her.) Same as {Nombril}.

Source : WordNet®

navel point
     n : the center point or middle of something [syn: {navel}]