From The Collaborative International Dictionary of English v.0.48 [gcide]:
Intercostal \In'ter*cos"tal\, adjective (Anat. & Physiol.) Between the ribs; pertaining to, or produced by, the parts between the ribs; as, intercostal respiration, in which the chest is alternately enlarged and contracted by the intercostal muscles.
From WordNet (r) 3.0 (2006) [wn]:
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