hyperthyroidism
noun
hy·per·thy·roid·ism
ˌhī-pər-ˈthī-ˌrȯi-ˌdi-zəm
: excessive functional activity of the thyroid gland
also
: the resulting condition marked especially by increased metabolic rate, enlargement of the thyroid gland, rapid heart rate, and high blood pressure
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Merriam-Webster unabridged
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