1

thyroid

play
noun thy·roid \ ˈthī-ˌrȯid \

Definition of thyroid

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

Recent Examples of thyroid from the Web

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.

First Known Use of thyroid

1787


2

thyroid

play
adjective thy·roid \ ˈthī-ˌrȯid \
variants: or less commonly thyroidal play \thī-ˈrȯi-dᵊl\

Definition of thyroid

1 a :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

Recent Examples of thyroid from the Web

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.

Origin and Etymology of thyroid

New Latin thyroides, from Greek thyreoeidēs shield-shaped, thyroid, from thyreos shield shaped like a door, from thyra door — more at door


THYROID Defined for English Language Learners

thyroid

play
noun

Definition of thyroid for English Language Learners

  • medical : a small gland in the neck that affects growth


THYROID Defined for Kids

thyroid

play
noun thy·roid \ ˈthī-ˌrȯid \

Definition of thyroid for Students

:a gland at the base of the neck that produces hormones which affect growth, development, and the rate at which the body uses energy

Medical Dictionary

1

thyroid

play
adjective thy·roid \ ˈthī-ˌrȯid \
variants: also thyroidal play \thī-ˈrȯid-ᵊl\

medical Definition of thyroid

1 a :of, relating to, affecting, or being the thyroid gland
  • thyroid disorders
2 :of, relating to, or being the thyroid cartilage

2

thyroid

noun

medical Definition of thyroid

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

Illustration of thyroid



Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

to curse or denounce

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

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!