thyroxin

Science Dictionary
thyroxine   (thī-rŏk'sēn', -sĭn)  Pronunciation Key 
An iodine-containing hormone secreted by the thyroid gland that increases the rate of cell metabolism and regulates growth. Thyroxine can also be made synthetically for treatment of hypothyroidism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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