1 of or relating to the heart
2 of or relating to the portion of the stomach connected to the oesophagus
3 a person with a heart disorder
4 a drug that stimulates the heart muscle (C17: from Latin cardiacus, from Greek, from kardia heart)
n failure of the pumping action of the heart, resulting in loss of consciousness and absence of pulse and breathing: a medical emergency requiring immediate resuscitative treatment
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"