1. Beneath a rib or the ribs. SYN: infracostal. 2. Denoting certain arteries, veins, and nerves.
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sub·cos·tal -'käs-təl adj situated or performed below a rib <a left \subcostal incision>
subcostal n a subcostal part (as a muscle)
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sub·cos·tal (səb-kosґtəl) inferior to or beneath a rib or all the ribs; called also infracostal.Medical dictionary. 2011.