Dictionary
hy•po•thy•roid•ism
Pronunciation: (hī"pu-thī'roi-diz"um), [key]—
n. Pathol.
1. deficient activity of the thyroid gland.
2. the condition produced by a deficiency of thyroid secretion, resulting in goiter, myxedema, and, in children, cretinism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.