From Middle French cardiaque, from Latin cardiacus, from Ancient Greek καρδιακός (kardiakós, “relating to the heart”), from καρδία (kardía, “heart”); by surface analysis, cardi- +‎ -ac.

• (Received Pronunciation) IPA^(key): /ˈkɑːdɪæk/
• (General American) IPA^(key): /ˈkɑɹdiˌæk/

• Audio (US):

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cardiac (not comparable)

1. (biology, medicine) Pertaining to the heart.

   the cardiac arteries

2. (biology, medicine) Pertaining to the cardia of the stomach; cardial (cardial is the usual adjective in this sense).
3. (medicine, archaic) Exciting action in the heart, through the medium of the stomach; cordial; stimulant.

• noncardiac

cardiac (plural cardiacs)

1. A person with heart disease.
2. (dated) Heart disease.

• Accardi, Arcadic

cardiac (not comparable)

1. cardiac

Borrowed from French cardiaque, from Latin cardiacus.

cardiac m or n (feminine singular cardiacă, masculine plural cardiaci, feminine and neuter plural cardiace)

1. cardiac