Relating to or belonging to a group of heart-related conditions or characteristics; having properties of the cardiacea group.
From 'cardiacea' + English suffix '-an' (belonging to or characteristic of). This creates an adjective form that describes membership in a category or possession of shared traits.
English speakers love converting nouns into adjectives with '-an' and '-ian'—it's the same impulse that makes 'democrat' become 'democratic' and 'reptile' become 'reptilian.'
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