noun (n)

• the mother of your father or mother(noun.person)

  Synonym:
  gran, grandma, grandmother, grannie, nan, nanna
  

  source: wordnet30
• an old woman(noun.person)

  source: wordnet30
• a reef knot crossed the wrong way and therefore insecure(noun.artifact)

  Synonym:
  granny knot
  

  source: wordnet30
• A grandmother; a grandam; familiarly, an old woman.(noun)

  source: webster1913