An iodine-containing hormone, C15H11I4NO4, produced by the thyroid gland, that increases the rate of cell metabolism and regulates growth and that is made synthetically for treatment of thyroid disorders. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "thyroxine" in a sentence
"The thyroid gland secretes an inactive thyroid hormone called thyroxine, also known as T4."
"Your brain needs thyroid hormone, called thyroxine or T4, to develop and function properly."
"It takes iodine from the food we eat to make iodine-containing hormones called thyroxine (T4) and triiodothyronine (T3)."