[ hahy-per-thahy-roi-diz-uh m ]
/ ˌhaɪ pərˈθaɪ rɔɪˌdɪz əm /

noun Pathology.

overactivity of the thyroid gland.
a condition resulting from this, characterized by increased metabolism and exophthalmos.

Nearby words

  1. hyperthermophile,
  2. hyperthrombinemia,
  3. hyperthymia,
  4. hyperthymism,
  5. hyperthyroid,
  6. hyperthyroxinemia,
  7. hypertonia,
  8. hypertonic,
  9. hypertrichosis,
  10. hypertriglyceridemia

Origin of hyperthyroidism

First recorded in 1895–1900; hyper- + thyroid + -ism

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hyperthyroidism

British Dictionary definitions for hyperthyroidism


/ (ˌhaɪpəˈθaɪrɔɪˌdɪzəm) /


overproduction of thyroid hormone by the thyroid gland, causing nervousness, insomnia, sweating, palpitation, and sensitivity to heatAlso called: thyrotoxicosis See exophthalmic goitre
Derived Formshyperthyroid, adjective, noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for hyperthyroidism



1895, from hyper- + thyroid + -ism.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for hyperthyroidism


[ hī′pər-thīroi-dĭz′əm ]


Pathologically excessive production of thyroid hormones.
The condition resulting from excessive activity of the thyroid gland, characterized by increased basal metabolism.
Related formshy′per•thyroid adj.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for hyperthyroidism


[ hī′pər-thīroi-dĭz′əm ]

An abnormality of the thyroid gland characterized by excessive production of thyroid hormone, which can result in an increased basal metabolic rate, causing weight loss, heart palpitations, and tremors. Compare hypothyroidism.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.