thyroid

noun
thy·​roid | \ ˈthī-ˌrȯid How to pronounce thyroid (audio) \

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 How to pronounce thyroid (audio) \
variants: or less commonly thyroidal \ thī-​ˈrȯi-​dᵊl How to pronounce thyroidal (audio) \

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 That is a novel part of this study, as sick people have received thyroid hormones for years, but never straight into their lungs in this manner. Jeremy Olson, Star Tribune, "Experimental hormone therapy may speed recovery for COVID patients," 2 Nov. 2020 Rich found the victims’ lungs lacked T3, a thyroid hormone that would normally be detectable. Jeremy Olson, Star Tribune, "Experimental hormone therapy may speed recovery for COVID patients," 2 Nov. 2020 The iodine tablets are generally not a good choice for pregnant women or anyone with thyroid issues or shellfish allergies. Popular Science, "Wood filters, hot rocks, and seven other ways to purify water in the wild," 2 Nov. 2020 The cancer had spread from the 9-year-old’s thyroid to her lymph nodes and into her lungs, scattering between 50 and 100 tiny tumors throughout her upper body. Jordan Erb, The Indianapolis Star, "After beating cancer, 19-year-old enrolls in nursing school to help kids battling illness," 22 Oct. 2020 Johnson has thyroid disease, which research has not ruled out as a risk factor for more severe cases of COVID-19. Rebecca Lurye, courant.com, "At Hartford rally, front-line workers share stories of layoffs, bouts of coronavirus and worry for the future," 20 Oct. 2020 The lump in the side of Jade’s neck was soon diagnosed as metastatic papillary thyroid cancer. Jordan Erb, The Indianapolis Star, "After beating cancer, 19-year-old enrolls in nursing school to help kids battling illness," 22 Oct. 2020 Drugs like this are often used to help manage inflammation that can be a symptom of conditions such as arthritis, severe allergies, asthma, intestinal disorders, thyroid disorders, and some types of cancer, MedlinePlus says. Sarah Jacoby, SELF, "Dexamethasone for COVID-19: What to Know About the Latest Drug President Trump Is Taking," 5 Oct. 2020 The thyroid essentially works like a thermostat for your body, says Gary LeRoy, M.D., the president of the American Academy of Family Physicians. Erica Sweeney, Good Housekeeping, "Why Am I Always Cold? 10 Reasons Why Experts Say You're Constantly Freezing," 30 Sep. 2020 Recent Examples on the Web: Adjective The pregnancy was delicate because of a thyroid condition Monica has, said Edgar, who works in a dairy while Monica stays home to care for their two other daughters. Rebekah L. Sanders, azcentral, "Meet Zoé, first baby born in 2020 at Banner Health facility in Phoenix area," 1 Jan. 2020 When thyroid hormones climb too high, the body destroys old bone faster than it can be replaced, which hastens osteoporosis. Hallie Levine, Health.com, "What Every Woman Should Know About Her Thyroid Gland," 5 Dec. 2019 Neighbors and family members, even their own children, diagnosed with serious medical conditions, from thyroid disease to cancer. NBC News, "A 'forever chemical' poisons drinking water near military bases," 16 Dec. 2019 Keep in mind, though, that even when treatment successfully eliminates hypothyroidism in a case like yours, the underlying thyroid disorder remains. Mayo Clinic News Network, chicagotribune.com, "Thyroid disorder may not show symptoms until pregnancy," 4 Oct. 2019 At the age of 12, Grace LaVigne developed a long-lasting friendship with a St. Paul doctor over an unlikely bonding experience — a thyroid tumor that caused frequent ear infections and could have done far worse. Frederick Melo, Twin Cities, "A Hill-Murray girl and her lifesaving doctor rally for the Bahamas after hurricane leaves 70,000 homeless," 23 Oct. 2019 Examples included antibiotics, anti-inflammatory (ibuprofen), anti-depressants, anti-diabetics, stimulants (caffeine), and reproductive and thyroid hormones. David Taylor, Houston Chronicle, "Cleveland PD offering safe place to dispose of drugs," 13 Sep. 2019 The thyroid produces thyroid hormone (TH), which regulates your body's metabolism, heartbeat, temperature, mood, and other important processes—reaching out to nearly every single cell in your body. Maggie O'neill, Health.com, "The Growths on This Child’s Tongue Led to an Extremely Rare Medullary Thyroid Cancer Diagnosis," 17 July 2019 So, what is thyroid cancer—specifically, medullary thyroid cancer? Maggie O'neill, Health.com, "The Growths on This Child’s Tongue Led to an Extremely Rare Medullary Thyroid Cancer Diagnosis," 17 July 2019

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.

See More

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

Noun

short for thyroid gland — more at thyroid entry 2

Adjective

borrowed from New Latin thyroīdēs, shortened from thyreoīdēs, borrowed from Greek thyreoeidḗs "shield-shaped (of the cartilage in the larynx)," from thyreós "stone put against a door to keep it shut, oblong shield" (probably originally noun derivative of an adjective meaning "shaped like a door," from thýra "door" + -eos, suffix of appurtenance) + -oeidēs -oid entry 2 — more at door

Note: The form thyroīdēs presumably arose because the word was taken as directly derived from thýra "door," rather than from thyreós. The word thyroeidḗs "like a door" is marginally attested in ancient Greek.

Keep scrolling for more

Learn More about thyroid

Time Traveler for thyroid

Time Traveler

The first known use of thyroid was circa 1741

See more words from the same year

Statistics for thyroid

Last Updated

23 Nov 2020

Cite this Entry

“Thyroid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thyroid. Accessed 2 Dec. 2020.

Keep scrolling for more

More Definitions for thyroid

thyroid

noun
How to pronounce thyroid (audio)

English Language Learners Definition of thyroid

medical : a small gland in the neck that affects growth

thyroid

noun
thy·​roid | \ ˈthī-ˌrȯid How to pronounce thyroid (audio) \

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 How to pronounce thyroid (audio) \
variants: also thyroidal \ thī-​ˈrȯid-​ᵊl How to pronounce thyroidal (audio) \

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

More from Merriam-Webster on thyroid

Nglish: Translation of thyroid for Spanish Speakers

Britannica.com: Encyclopedia article about thyroid

Comments on thyroid

What made you want to look up thyroid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!