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Alternative forms[edit]


Borrowed from New Latin thyreoīdēs, from Ancient Greek θῠρεοειδής (thureoeidḗs, shield-shaped), from θῠρεός (thureós, oblong shield) +‎ -ειδής (-eidḗs, -form, -like).


  • IPA(key): /ˈθaɪ.ɹɔɪd/
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  • Rhymes: -aɪɹɔɪd


thyroid (not comparable)

  1. (anatomy) Of, relating to, or being the thyroid cartilage.
  2. (anatomy) Of, relating to, or being the thyroid gland.
    1. Suggestive of a disordered thyroid gland.
      a thyroid personality

Derived terms[edit]



explainer video about the human thyroid

thyroid (plural thyroids)

  1. (anatomy) Ellipsis of thyroid cartilage.
  2. (anatomy) Ellipsis of thyroid gland.
    • 2013 August 9, Douglas Main, “Israel Outlaws Water Fluoridation”, in Live Science[1], retrieved 2013-09-30:
      Israel is one of the few countries that widely fluoridates, besides the United States, Canada, Ireland, New Zealand and Australia. Fluoridation, the addition of fluoride to public drinking water supplies to reduce cavities, is the subject of intense controversy, especially outside of the United States. But opposition to the practice, on the grounds that fluoride has adverse effects on the thyroid, brain and bones, and is an unethical form of mass-medication, appears to be growing.
    1. (medicine) An extract prepared from the thyroid gland of animals and used in treating deficiency of thyroid hormones.

Derived terms[edit]