Definition of "thoracic"

thoracic

/θəˈɹæsɪk/

adjective
not comparable
1. (anatomy) Of the thorax.
  Quotations
  Those wings were powered by massive thoracic muscles—muscles no longer needed by a flightless queen.
  2016, Justin O. Schmidt, The Sting of the Wild, Johns Hopkins University Press,, page 106
noun
plural thoracics
1. (zoology) One of a group of fishes having the ventral fins placed beneath the thorax or beneath the pectoral fins.