#1 rib n. support resembling the rib of an animal. wn
#2 rib n. [costa] 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). wn
#3 rib v. form vertical ribs by knitting; "A ribbed sweater". wn
#4 rib v. [ridicule, roast, guy, blackguard, laugh at, jest at, make fun, poke fun] subject to laughter or ridicule; "The satirists ridiculed the plans for a new opera house"; "The students poked fun at the inexperienced teacher"; "His former students roasted the professor at his 60th birthday". wn
#5 rib n. cut of meat including one or more ribs. wn
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