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noun hyperthyroidism n. (Med.) An abnormality of the thyroid gland characterized by the pathologically excessive production of thyroid hormones; also, the resulting condition characterized by increased metabolism, weight loss, rapid heart rate, high blood pressure, an enlarged thyroid gland and sometimes exophthalmos. It leads to, and may be confirmed by, high plasma levels of triiodothyronine or thyroxin. Synonyms: thyrotoxicosis.
Collaborative International Dictionary of English 0.48
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