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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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
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.
David has a thyroid condition which makes losing weight more difficult.
From BBC • May 16, 2026
Biotin can interfere with certain blood tests used to monitor cancers, including prostate, thyroid, ovarian and breast cancers.
From Science Daily • May 7, 2026
The same AI pattern-recognition that’s learning to spot breast tumors is being applied to thyroid screening, lung nodule detection and colonoscopies.
From The Wall Street Journal • May 4, 2026
My voice therapist thought it could’ve been the combination of intubation and having an enlarged thyroid due to my autoimmune disease.
From Slate • Apr. 18, 2026
My zoology thesis was a functional analysis of the thyroid gland of the three-toed sloth.
From "Life of Pi" by Yann Martel
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
