Definition of thyroid in English:

thyroid

Line breaks: thy|roid
Pronunciation: /ˈθʌɪrɔɪd
 
/

noun

1 (also thyroid gland) A large ductless gland in the neck which secretes hormones regulating growth and development through the rate of metabolism: [as modifier]: thyroid function thyroid hormones
More example sentences
  • Thyroid medicine can replace the hormone your thyroid gland usually makes.
  • When your thyroid gland produces too much of the hormone thyroxine, you develop hyperthyroidism.
  • This happens because the thyroid gland is not functioning properly.
1.1 [mass noun] An extract prepared from the thyroid gland of animals and used in treating deficiency of thyroid hormones.
More example sentences
  • He was horrified that I had been taking dried animal thyroid and put me on Synthroid.
  • Any patient with suspected myxedema coma should be treated presumptively with thyroid hormone.
  • A month later, after he started taking thyroid extract, the life of the patient had been transformed.
2 (also thyroid cartilage) A large cartilage of the larynx, a projection of which forms the Adam’s apple in humans.
More example sentences
  • The epiglottis is a flap-like cartilage connected to the thyroid cartilage.
  • The corpsman then palpated the thyroid cartilage and found the ‘Adam's apple’ or laryngeal prominence.
  • The hyoid bone, thyroid cartilage, and cricoid cartilages are located within the central portion of the neck.

Origin

early 18th century (as an adjective): from Greek (khondros) thureoeidēs 'shield-shaped (cartilage)', from thureos 'oblong shield'.

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