| cardboard | (adjective) without substance | Synonyms: unlifelike |
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| cardiac | (adjective) of or relating to the heart | - |
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| cardinal | (adjective) being or denoting a numerical quantity but not order | - |
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| (adjective) serving as an essential component | Synonyms: central, fundamental, key, primal |
| cardiographic | (adjective) of or relating to a cardiograph | - |
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| cardiologic | (adjective) of or relating to or used in or practicing cardiology | - |
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| cardiopulmonary | (adjective) of or pertaining to or affecting both the heart and the lungs and their functions | Synonyms: cardiorespiratory |
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| cardiorespiratory | (adjective) of or pertaining to or affecting both the heart and the lungs and their functions | Synonyms: cardiopulmonary |
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| cardiovascular | (adjective) of or pertaining to or involving the heart and blood vessels | - |
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