noun (n)

• a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing)(noun.body)

  source: wordnet30
• any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates)(noun.body)

  Synonym:
  rib
  

  source: wordnet30
• A rib of an animal or a human being.(noun)

  source: webster1913