noun Pathology.
deficient activity of the thyroid gland.
the condition produced by a deficiency of thyroid secretion, resulting in goiter, myxedema, and, in children, cretinism.

1900–05; hypo- + thyroid + -ism

hypothyroid, adjective
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World English Dictionary
hypothyroidism (ˌhaɪpəʊˈθaɪrɔɪˌdɪzəm)
1.  insufficient production of thyroid hormones by the thyroid gland
2.  any disorder, such as cretinism or myxoedema, resulting from this
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hypothyroidism hy·po·thy·roid·ism (hī'pō-thī'roi-dĭz'əm)

  1. Insufficient production of thyroid hormones.

  2. A pathological condition resulting from thyroid insufficiency, which may lead to cretinism or myxedema.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hypothyroidism   (hī'pō-thī'roi-dĭz'əm)  Pronunciation Key 
An abnormality of the thyroid gland characterized by insufficient production of thyroid hormone, which can result in a decreased basal metabolic rate, causing weight gain and fatigue. Compare hyperthyroidism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


a deficiency in hormone production by the thyroid gland.

Learn more about hypothyroidism with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Also this center treats hormone imbalance, hypothyroidism and fatigue.
Allowed to progress, severe hypothyroidism can drop the body into a deadly coma.
Hypothyroidism is a condition in which the thyroid gland does not make enough
  thyroid hormone.
Many permanent or temporary conditions can reduce thyroid hormone secretion and
  cause hypothyroidism.
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