- designating or of a large ductless gland lying in front and on either side of the trachea and secreting the hormone thyroxine, which regulates body growth and metabolism: the malfunctioning or congenital absence of this gland can cause goiter, cretinism, etc.
- designating or of the principal cartilage of the larynx, forming the Adam's apple
Origin of thyroidModern Latin thyroides from Classical Greek thyreoeid?s, shield-shaped from thyreos, large shield, door-shaped shield from thyra, door + -eid?s, -oid
- the thyroid gland
- the thyroid cartilage
- an artery, nerve, etc. in the region of the thyroid
- a preparation of the thyroid gland of certain animals, used in treating goiter, myxedema, etc.also thyroid extract