a. Obs. rare–1. [f. Gr. θωρακ-, THORAX + -IAL.] = THORACIC a. 1. T. canal, the thoracic duct.
1716. M. Davies, Athen. Brit., III. Diss. Physick, 5. Speaking more at large of the Thorakial Canal, than a Roman Physician … near an Age before.
