| Thoracic 1. (a.) Of or pertaining to the thorax, or chest. 2. (n.) One of a group of fishes having the ventral fins placed beneath the thorax or beneath the pectoral fins. Thesaurus Entries bosomed, breasted, cetacean, chested, chordate, mammary, mammate, mammiform, mammillary, marsupial, nippled, papillary, papillose, papulous, pectoral, pigeon-breasted, teated, thoracic, vertebrate |