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

 

hypothyroidism

 noun
noun
BrE BrE//ˌhaɪpəʊˈθaɪrɔɪdɪzəm//
 
; NAmE NAmE//ˌhaɪpoʊˈθaɪrɔɪdɪzəm//
 
[uncountable](medical)
 
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a condition in which the thyroid is not active enough, making growth and mental development slower than normal
See the Oxford Advanced American Dictionary entry: hypothyroidism