Abnormally high levels of glucose (sugar) in the blood, typically above 180 mg/dL. A hallmark of diabetes mellitus and can lead to serious complications if prolonged.
From Greek 'hyper' (above/excessive), 'glykys' (sweet), and 'haima' (blood), literally meaning 'excessive sweet blood.' The term was coined in the late 19th century as chemical tests for blood sugar were developed.
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