hy·po·thy·roid·ism

[hahy-puh-thahy-roi-diz-uhm]
noun Pathology.
1.
deficient activity of the thyroid gland.
2.
the condition produced by a deficiency of thyroid secretion, resulting in goiter, myxedema, and, in children, cretinism.

Origin:
1900–05; hypo- + thyroid + -ism

hy·po·thy·roid, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
hypothyroidism (ˌhaɪpəʊˈθaɪrɔɪˌdɪzəm) [Click for IPA pronunciation guide]
 
n
1.  insufficient production of thyroid hormones by the thyroid gland
2.  any disorder, such as cretinism or myxoedema, resulting from this
 
hypo'thyroid
 
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Hypothyroidism is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
American Heritage
Medical Dictionary

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

  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
Encyclopedia

hypothyroidism

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
Smoking triples the risk for developing thyroid disease, particularly
  hyperthyroidism and hypothyroidism.
Many permanent or temporary conditions can reduce thyroid hormone secretion and
  cause hypothyroidism.
Also this center treats hormone imbalance, hypothyroidism and fatigue.
The goal of treatment is to control conditions that can raise triglyceride
  levels such as obesity, hypothyroidism, and diabetes.
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