thoracic /θəˈɹæsɪk/adjective 1noun 1forms 1 adjective1 •Of the thorax.Those wings were powered by massive thoracic muscles—muscles no longer needed by a flightless queen. — 2016 noun1 •One of a group of fishes having the ventral fins placed beneath the thorax or beneath the pectoral fins. formsthoracics
