A town in Ceredigion, Wales. / A surname.

(cardiology) The visual output an electrocardiograph produces

A cardinal of the Roman Catholic Church who is bishop of one of the cardinal ("hinge") dioceses of the Province of Rome. / (more loosely) A cardinal who is a bishop anywhere.

a cardinal number used as an adjective

(Christianity) The four virtues of prudence, justice, fortitude, and temperance.

A bright-red-colored beetle, Pyrochroa serraticornis. / A related species, Pyrochroa coccinea / A more distantly related species, Schizotus pectinicornis

(anatomy, cardiology) The striated and involuntary muscle of the vertebrate heart.

(cardiology, pathology) Sudden and complete cessation of the heartbeat resulting in the loss of effective circulation of the blood.

A first aid procedure for cardiac arrest involving compression of the chest wall alternating with artificial respiration.

(biology, medicine) Pertaining to the heart. / (biology, medicine) Pertaining to the cardia; cardial (cardial is the usual adjective in this sense).