a. rare. [f. Gr. καρδί-α heart + -AL: etymologically irregular.] Pertaining to the heart; = CARDIAC A. 1.
1868. Duncan, Insect World, Introd. 141. The cardial portion of the dorsal vessel.
1887. Sala, in Illustr. Lond. News, 9 April, 402. Everyone whose cardial arrangements are not as hard as the nether millstone.
