Between the ribs. [inter- + L. costa, rib]
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in·ter·cos·tal .int-ər-'käs-təl adj situated or extending between the ribs <\intercostal vessels> <\intercostal spaces>
intercostal n an intercostal part or structure (as a muscle or nerve)
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in·ter·cos·tal (in″tər-kosґtəl) [inter- + costal] situated between the ribs.Medical dictionary. 2011.