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of or relating to the .
of or relating to the largest cartilage of the larynx, forming the projection known in humans as the Adam’s apple.
.
the thyroid cartilage.
an artery, vein, etc., in the thyroid region.
Medicine/Medical. a preparation made from the of certain animals, used in treating hypothyroid conditions.
Contemporary Examples

thyroid patients used to be given thyroid hormone until their symptoms stopped.
Treat the Symptom, Not the Measurement Megan McArdle October 31, 2012

Of the roughly 360,000 children, there were 44 suspected cases of thyroid cancer.
The Fukushima Generation: New Data on Birth Defects in Post-Meltdown Japan Nathalie-Kyoko Stucky, Jake Adelstein September 25, 2013

To this day, I take a half grain of thyroid—and an occasional Raisinet.
Mel Brooks Is Always Funny and Often Wise in This 1975 Playboy Interview Alex Belth February 15, 2014

PCBs have been shown to have chronically toxic effects on the thyroid, stomach, liver, kidneys, and immune system.
Did Mitt Romney Help Lake Michigan’s Polluters? Wayne Barrett July 28, 2012

Her mother died of thyroid cancer just two weeks into her freshman year.
Star Life Coach AJ Johnson’s Holiday Health Secrets Allison Samuels December 7, 2012

Historical Examples

It is situated below the thyroid cartilage, with which it is connected by a membrane, the crico-thyroid.
Voice Production in Singing and Speaking Wesley Mills

What, then, is the nature of the thyroid gland in Ammocœtes?
The Origin of Vertebrates Walter Holbrook Gaskell

These are the thymus and thyroid glands, apparently vestigial structures.
Man And His Ancestor Charles Morris

But the gland which in this connection is of first importance is the thyroid.
Pedagogical Anthropology Maria Montessori

The spleen, the thyroid, the suprarenal glands have taken on a new significance.
Makers of Modern Medicine James J. Walsh

adjective
of or relating to the thyroid gland
of or relating to the largest cartilage of the larynx
noun
See thyroid gland
Also thyroid extract. the powdered preparation made from the thyroid gland of certain animals, used to treat hypothyroidism
adj.

1690s (in reference to both the cartilage and the gland), from Greek 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” (see -oid). The noun, short for thyroid gland, is recorded from 1849.

thyroid thy·roid (thī’roid’)
n.

The thyroid gland.

The thyroid cartilage.

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.
thyroid [(theye-royd)]

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