Etymology
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thyroid (adj.)

1690s (in reference to both the cartilage and the gland), from Greek thyreoeides "shield-shaped" (in khondrosthyreoeides "shield-shaped cartilage," used by Galen to describe the "Adam's apple" in the throat), from thyreos "oblong, door-shaped shield" (from thyra "door," from PIE root *dhwer- "door, doorway") + -eides "form, shape" (see -oid). The noun, short for thyroid gland, is recorded from 1849.

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Definitions of thyroid
1
thyroid (adj.)
of or relating to the thyroid gland;
thyroid deficiency
Synonyms: thyroidal
thyroid (adj.)
suggestive of a thyroid disorder;
thyroid personality
2
thyroid (n.)
located near the base of the neck;
Synonyms: thyroid gland
From wordnet.princeton.edu