Navel

n.
  1. (Anat.) A mark or depression in the middle of the abdomen; the umbilicus; called also belly button in humans. See Umbilicus.
  2. The central part or point of anything; the middle.
  3. (Gun.) An eye on the under side of a carronade for securing it to a carriage.
    4. Navel gall ,
    a bruise on the top of the chine of the back of a horse, behind the saddle.
    Navel point . (Her.)
    Same as Nombril.