Etymology
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intercostal (adj.)

"between the ribs," 1590s; see inter- + costal.

updated on October 17, 2012

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Definitions of intercostal from WordNet
1
intercostal (n.)
muscles between the ribs; they contract during inspiration;
Synonyms: intercostal muscle / musculus intercostalis
2
intercostal (adj.)
located or occurring between the ribs;
intercostal muscles
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.