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n.
a preparation of the hormone triiodothyronine, produced by the thyroid gland, that is used to treat conditions of thyroid deficiency. It is administered by mouth or injection and has a rapid but short-lived effect. Trade name: Tertroxin.
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li·o·thy·ro·nine (li″o-thiґro-nēn) a synthetic pharmaceutical preparation of the levorotatory isomer of triiodothyronine; it is more potent and has a more rapid action than thyroxine.Medical dictionary. 2011.