Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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false rib any of the lower five pairs of ribs that are not attached to the breastbone. (Cf. true rib.)
floating rib any rib, such as the two lower pairs in humans, that is not attached to other ribs or the breastbone.
rib cage the structure of ribs forming a cage around the internal organs of the chest.
true rib a rib that is attached by cartilage directly to the sternum, as any of the upper seven pairs of ribs in humans. (Cf. false rib.)