thyroid

noun
thy·roid | \ ˈthī-ˌrȯid \

Definition of thyroid 

(Entry 1 of 2)

1 : a large bilobed endocrine gland of vertebrates lying at the anterior base of the neck and producing especially the hormones thyroxine and triiodothyronine

2 : a preparation of the thyroid gland of various domestic animals used in treating thyroid disorders

thyroid

adjective
thy·roid | \ ˈthī-ˌrȯid \
variants: or less commonly thyroidal \thī-ˈrȯi-dᵊl \

Definition of thyroid (Entry 2 of 2)

1a : of, relating to, or being the thyroid gland

b : suggestive of a disordered thyroid a thyroid personality

2 : of, relating to, or being the chief cartilage of the larynx

Examples of thyroid in a Sentence

Recent Examples on the Web: Noun

Breast cancer survivor Mary Tinnes' mother passed away from breast cancer in 1994 and, since that time, members of her family have battled thyroid, lung, skin, rectal, gall bladder and breast cancers. Candace Jordan, chicagotribune.com, "Discovery Ball raises more than $3 million for American Cancer Society," 2 May 2018 Compared with the controls, flight attendants had increased rates of breast, uterine, cervical, gastrointestinal, skin and thyroid cancers. Nicholas Bakalar, New York Times, "Airline Crew Have Higher Cancer Rates," 5 July 2018 Eyebrow hair loss is also a common symptom of thyroid deficiency. Jane Chertoff, SELF, "This Is Why Your Eyebrows Are Thinner Than They Used to Be—and What to Do About It," 13 July 2018 Shortly after my separation came my trial run: A thyroid ultrasound initially appeared to show a malignancy that was soon declared normal. Washington Post, "When you’re aging alone, who will take care of you if you get sick?," 9 July 2018 The chemicals found – perfluorooctane sulfonate and perfluorooctanoic acid – are in firefighting foam and implicated in some types of cancer and thyroid effects, school officials said, pointing to several scientific studies. Martin E. Comas, OrlandoSentinel.com, "Brevard County schools to test drinking water at 13 campuses for chemical contamination," 3 July 2018 The comparison revealed higher rates of uterine, cervical, breast, gastrointestinal, thyroid and melanoma cancers among flight attendants. Brigit Katz, Smithsonian, "Flight Attendants May Face Increased Risk for Many Cancers, Study Finds," 27 June 2018 View Sample Sign Up Now Mordukhovich found higher prevalence of breast, melanoma, uterine, gastrointestinal, thyroid and cervical cancers among the flight attendants compared to the general public. Alice Park, Time, "Flight Attendants Have Higher Rates of Many Cancers, Study Says," 26 June 2018 Uterine, cervical, thyroid, breast, gastrointestinal, and non-melanoma skin cancers were all found to be more prevalent in flight attendants, according to an article published Monday in the journal Environmental Health. Brittany Shoot, Fortune, "Flight Attendants Have Higher Cancer Rates, Study Finds," 26 June 2018

Recent Examples on the Web: Adjective

Possible causes include thyroid surgery to fully or partially remove the gland for some reason, like cancer. Carolyn L. Todd, SELF, "Are Hashimoto’s Disease and Hypothyroidism the Same Thing?," 14 May 2018 Treatment involves taking a once-daily dose of levothyroxine, a synthetic replacement for thyroid hormone, according to the National Institute of Diabetes and Digestive and Kidney Diseases. Carolyn L. Todd, SELF, "Are Hashimoto’s Disease and Hypothyroidism the Same Thing?," 14 May 2018 Taught Me How to Sink or Swim’ Miller was hospitalized for what was believed to be a thyroid condition on April 10, two weeks after she was released from prison and transferred to a halfway house. Mariah Haas, PEOPLE.com, "Dance Moms' JoJo Siwa Visited Ex-Coach Abby Lee Miller in the Hospital: 'She Was Not Good'," 20 Apr. 2018 Babies and young children, whose thyroid gland is one of the most radiation-sensitive parts of the body, are at highest risk. Erika Butler, The Aegis, "Harford residents near Peach Bottom atomic plant need potassium iodide on hand," 23 May 2018 Soy foods don’t affect thyroid function in people with healthy thyroids, found a Loma Linda University review of 14 studies. Marygrace Taylor, Good Housekeeping, "Is Soy Good Or Bad For You? We Have The Science-Backed Answer.," 17 May 2017 Towers, who served as Padres G.M from 1995 to 2009, lost his battle with thyroid cancer on Jan. 30 at the age of 56. Kevin Acee, sandiegouniontribune.com, "Padres to honor Kevin Towers, Rob Picciolo with patches," 8 May 2018 One word of caution: some studies have shown that activated charcoal can interfere with other organic molecules, like those in thyroid medication or birth control. Macaela Mackenzie, Allure, "How to Tell If Your Bad Body Odor Is Cause for Concern," 8 May 2018 Both block iodine, the main building block for thyroid hormone, from getting into the thyroid gland, thereby suppressing the production of new thyroid hormone. Andrea K. Mcdaniels, baltimoresun.com, "What is Graves' disease? A MedStar endocrinologist explains," 5 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'thyroid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of thyroid

Noun

1787, in the meaning defined at sense 1

Adjective

circa 1741, in the meaning defined at sense 1a

History and Etymology for thyroid

Adjective

New Latin thyroides, from Greek thyreoeidēs shield-shaped, thyroid, from thyreos shield shaped like a door, from thyra door — more at door

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Statistics for thyroid

Last Updated

22 Aug 2018

Look-up Popularity

Time Traveler for thyroid

The first known use of thyroid was circa 1741

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More Definitions for thyroid

thyroid

noun

English Language Learners Definition of thyroid

medical : a small gland in the neck that affects growth

thyroid

noun
thy·roid | \ ˈthī-ˌrȯid \

Kids Definition of thyroid

: a gland at the base of the neck that produces hormones which affect growth, development, and the rate at which the body uses energy

thyroid

adjective
thy·roid | \ ˈthī-ˌrȯid \
variants: also thyroidal \thī-ˈrȯid-ᵊl \

Medical Definition of thyroid 

(Entry 1 of 2)

1a : of, relating to, affecting, or being the thyroid gland thyroid disorders

2 : of, relating to, or being the thyroid cartilage

thyroid

noun

Medical Definition of thyroid (Entry 2 of 2)

1 : a large bilobed endocrine gland of craniate vertebrates that arises as a median ventral outgrowth of the pharynx, lies in the anterior base of the neck or anterior ventral part of the thorax, is often accompanied by lateral accessory glands sometimes more or less fused with the main mass, and produces especially the hormones thyroxine and triiodothyronine

called also thyroid gland

2 : a preparation of the thyroid gland of various domesticated food animals (as pigs) containing approximately ¹/₁₀ percent of iodine combined in thyroxine and used in treating thyroid disorders

called also thyroid extract

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