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cost(o)-

A rib or ribs.

Latin costa, a rib.

Several adjectives describe the ribs plus another part of the body: costocervical, of ribs and neck; costoclavicular, of the ribs and the clavicle or shoulder blade; costosternal, of the ribs and the sternum or breast bone. The usual adjective relating to the ribs is costal. The adjective costive means constipated and is not a member of this set.

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