Relating to the ribs and the clavicle.
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cos·to·cla·vic·u·lar -klə-'vik-yə-lər, -kla- adj of or relating to a ligament connecting the costal cartilage of the first rib with the clavicle
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cos·to·cla·vic·u·lar (kos″to-klə-vikґu-lər) pertaining to the ribs and clavicle.Medical dictionary. 2011.