adjective thy·roid \ˈthī-ˌrid\

Definition of THYROID

a :  of, relating to, or being the thyroid gland
b :  suggestive of a disordered thyroid <a thyroid personality>
:  of, relating to, or being the chief cartilage of the larynx

Variants of THYROID

thy·roid also thy·roi·dal \thī-ˈri-dəl\

Origin of THYROID

New Latin thyroides, from Greek thyreoeidēs shield-shaped, thyroid, from thyreos shield shaped like a door, from thyra door — more at door
First Known Use: circa 1741



medical : a small gland in the neck that affects growth

Full Definition of THYROID

:  a large bilobed endocrine gland of vertebrates lying at the anterior base of the neck and producing especially the hormones thyroxine and triiodothyronine
:  a preparation of the thyroid gland of various domestic animals used in treating thyroid disorders

First Known Use of THYROID

THYROIDAL Defined for Kids


noun thy·roid \ˈthī-ˌrid\

Definition of THYROID for Kids

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


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June 30, 2015
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