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hyperthyroidism (n.)

1895, from hyper- "over, exceedingly, to excess" + thyroid + -ism.

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Definitions of hyperthyroidism from WordNet

hyperthyroidism (n.)
an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones;
Synonyms: thyrotoxicosis
From wordnet.princeton.edu