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Definition of: thyroid
(thī′roid) adjective
1. Relating or pertaining to the thyroid cartilage or the thyroid gland.
2. Shaped like a shield; also, having a shield-shaped marking.
—noun
1. The thyroid cartilage or gland.
2. The dried and powdered thyroid gland of certain domesticated food animals, used in the treatment of myxedema, goiter, obesity, and other disorders. [<Gk. thyreoeidēs shield-shaped <thyreos large shield + eidos form]
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