thyroid
Americanadjective
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of or relating to the thyroid gland.
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of or relating to the largest cartilage of the larynx, forming the projection known in humans as the Adam's apple.
noun
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thyroids
plural
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the thyroid cartilage.
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an artery, vein, etc., in the thyroid region.
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Medicine/Medical. a preparation made from the thyroid glands of certain animals, used in treating hypothyroid conditions.
adjective
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of or relating to the thyroid gland
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of or relating to the largest cartilage of the larynx
noun
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See thyroid gland
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Also: thyroid extract. the powdered preparation made from the thyroid gland of certain animals, used to treat hypothyroidism
Other Word Forms
Derived Forms
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antithyroidadjective
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postthyroidaladjective
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prethyroidadjective
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thyroidaladjective
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thyroidlessadjective
Inflected Forms
Nouns
Etymology
Origin of thyroid
1685–95; variant of thyreoid < Greek thyreoeidḗs shield-shaped, equivalent to thyre ( ós ) oblong shield (literally, doorlike object, equivalent to thýr ( a ) door + -eos adj. suffix) + -oeidēs -oid
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
The second influence comes from thyroid hormones, which are best known for regulating metabolism but also have crucial roles in growth and development.
From Science Daily ● Oct. 31, 2026
His long-term partner, Sarah Fisher, died several months earlier, in December 2025, after she was diagnosed with thyroid cancer.
From BBC ● Oct. 2, 2026
He took my blood and sent it off to be tested for testosterone as well as a bunch of other things, including thyroid and iron levels.
From The Wall Street Journal ● Sep. 12, 2026
California will begin phasing out paraquat, a powerful weedkiller associated with birth defects, thyroid issues and other serious health problems.
From Los Angeles Times ● Aug. 11, 2026
I asked, surprised at the anger in his thyroid eyes.
From "Invisible Man" by Ralph Ellison
With a million better things to do, we race the beagle to the vet, who mutters a bunch of things about thyroids and further tests.
From Los Angeles Times ● Dec. 21, 2018
Sadly there are no talking spleens or thyroids or wombs in Mr. Hamblin’s book.
From New York Times ● Dec. 22, 2016
Government scientists, drawing on data from Nagasaki and Hiroshima, used to visit schools to check thyroids and radioactivity levels, recalled Peterson, another advocate.
From The Guardian ● Jun. 6, 2015
Yet when Japanese scientists and inspected the bodies of 38,000 children living in the Fukushima Prefecture, they found 36 percent had abnormal growths on their thyroids a year after the accident.
From Slate ● Apr. 18, 2013
Of course, the radioactive strontium they ate was concentrated in their bones, and the radioactive iodine was concentrated in their thyroids.
From "Cosmos" by Carl Sagan
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
