Definition of hyperthyroidism noun from the Oxford Advanced Learner's Dictionary

 

hyperthyroidism

 noun
noun
BrE BrE//ˌhaɪpəˈθaɪrɔɪdɪzəm//
 
; NAmE NAmE//ˌhaɪpərˈθaɪrɔɪdɪzəm//
 
[uncountable](medical)
 
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a condition in which the thyroid is too active, making the heart and other body systems function too quickly
See the Oxford Advanced American Dictionary entry: hyperthyroidism