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English word cardiac comes from Proto-Indo-European *ḱr̥d-
*ḱr̥d- (Proto-Indo-European)
καρδία (Ancient Greek)
καρδιακός (Ancient Greek)
cardiacus (Latin)
cardiaque (Middle French)
cardiac (English)
(medicine, archaic) Exciting action in the heart, through the medium of the stomach; cordial; stimulant.. Pertaining to the cardia.. Pertaining to the heart. (dated) Heart disease.. (medicine) A medicine that excites action in the stomach.. A person with heart disease.