of or pertaining to the thyroid gland.
of or pertaining to the largest cartilage of the larynx, forming the projection known in humans as the Adam's apple.
the thyroid cartilage. See diag. under larynx.
an artery, vein, etc., in the thyroid region.
Medicine/Medical. a preparation made from the thyroid glands of certain animals, used in treating hypothyroid conditions.

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

thyroidal, adjective
thyroidless, adjective
antithyroid, adjective, noun
postthyroidal, adjective
prethyroid, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thyroid (ˈθaɪrɔɪd)
1.  of or relating to the thyroid gland
2.  of or relating to the largest cartilage of the larynx
3.  See thyroid gland
4.  Also: thyroid extract the powdered preparation made from the thyroid gland of certain animals, used to treat hypothyroidism
[C18: from New Latin thyroidēs, from Greek thureoeidēs, from thureos oblong (literally: door-shaped) shield, from thura door]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1693 (in ref. to both the cartilage and the gland), from Gk. thyreoiedes "shield-shaped" (in khondros thyreoiedes "shield-shaped cartilage," used by Galen to describe the "Adam's apple" in the throat), from thyreos "oblong, door-shaped shield" (from thyra "door") + -eides "form, shape." The noun, short
for thyroid gland, is recorded from 1849.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

thyroid thy·roid (thī'roid')

  1. The thyroid gland.

  2. The thyroid cartilage.

  3. A powdered preparation of the thyroid gland of certain domestic animals, used in the treatment of cretinism and myxedema, in certain cases of obesity, and in skin disorders.

thy'roid' adj.
thy·roi'dal adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
thyroid [(theye-royd)]

A large gland in the neck that functions in the endocrine system. The thyroid secretes hormones that regulate growth and metabolism.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Iodine, a mineral essential for proper thyroid functioning and mental
  development, may be added too.
They concentrate in the thyroid and represent a potential threat of thyroid
  cancer, among other illnesses.
She was suffer- ing from an enlarged thyroid gland and was extremely thin.
The surgeon chooses from a number of prefabricated sizes and inserts one
  through a hole in the thyroid cartilage.
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