A two-lobed endocrine gland found in all vertebrates, located in front of and on either side of the trachea in human beings, and producing various hormones, such as triiodothyronine and calcitonin.

Excerpted from The American Heritage Dictionary of the English Language, Third Edition Copyright © 1992 by Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V., further reproduction and distribution restricted in accordance with the Copyright Law of the United States. All rights reserved.

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