hypothyroidism
noun/ˌhaɪpəʊˈθaɪrɔɪdɪzəm/
/ˌhaɪpəʊˈθaɪrɔɪdɪzəm/
[uncountable] (medical)- a condition in which the thyroid is not active enough, which can cause problems such as feeling very tired and gaining weight, and in a child can cause slower growth
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hypothyroidism