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Definition of: thyroxin
(thī·rok′sin) noun Biochem.
A white, odorless, crystalline compound, C15,Η11O4NΙ4, obtained as the hormone of the thyroid gland and also made synthetically: used in the treatment of thyroid disorders. Also thy·rox′ine (-sēn, -sin). [<THYR(O)- + OXY- + -IN]
—thy·rox·in·ic (thī′rok·sin′ik) adjective
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