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thyroglobulin thy·ro·glob·u·lin (thī'rō-glŏb'yə-lĭn)
A protein, usually stored in the colloid of the thyroid gland, that has properties similar to the globulins and that yields various amino acids, including amino acids that contain iodine, when hydrolyzed.
A substance obtained by the fractionation of thyroid glands from the hog and used as a thyroid hormone in the treatment of hypothyroidism.