The Collaborative International Dictionary of English v.0.48:

Granny \Gran"ny\, n.
   A grandmother; a grandam; familiarly, an old woman.
   [1913 Webster]

   Granny's bend, or Granny's knot (Naut.), a kind of
      insecure knot or hitch; a reef knot crossed the wrong way.
      [1913 Webster]