Definition of rib noun from the Oxford Advanced American Dictionary

     

    rib

     noun
    noun
    NAmE//rɪb//
     
     
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  1. 1[countable] any of the curved bones that are connected to the spine and surround the chest a broken/bruised/cracked rib Stop poking me in the ribs! see also rib cage
  2. 2[uncountable, countable] a piece of meat with one or more bones from the ribs of an animal see also short ribs, spare rib
  3. 3[countable] a curved piece of wood, metal, or plastic that forms the frame of a boat, roof, etc. and makes it stronger a roof with rib vaulting
  4. 4 [countable] one of the raised lines in some types of knitting, or a pattern of these
  5. Idioms
    dig somebody in the ribs
     
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    to push your finger or your elbow into someone's side, especially to attract their attention
See the Oxford Advanced Learner's Dictionary entry: rib