A medical condition involving an incomplete closure of the heart, particularly relating to abnormal heart valve closure.
From Greek 'a-' (not) + 'kleistos' (closed) + 'kardia' (heart), literally 'heart without closure,' describing a pathological cardiac condition.
This term combines three Greek roots to describe a single heart defect — it's an example of medical terminology as a specialized language where doctors compress complex anatomy into single Latin-Greek words.
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