levothyroxine
noun
le·vo·thy·rox·ine
variants
or British laevothyroxine
: the levorotatory isomer of thyroxine that is administered in the form of its sodium salt C15H10I4NNaO4 in the treatment of hypothyroidism see levothroid, levoxyl, synthroid
Cite this Entry
“Levothyroxine.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/levothyroxine. Accessed 6 Dec. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share