Definitions of rib:

• noun:   support resembling the rib of an animal
• noun:   a projecting molding on the underside of a vault or ceiling; may be ornamental or structural
• noun:   a riblike supporting or strengthening part of an animal or plant
• noun:   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:   a teasing remark
• noun:   cut of meat including one or more ribs
• verb:   form vertical ribs by knitting

  Example: "A ribbed sweater"

• verb:   subject to laughter or ridicule