English
levothyroxine
From levo- + thyroxine.
Today it means
noun The levorotatory isomer of thyroxine (trademark Levothyroid, Levoxyl, Synthroid) that is administered in the form of its sodium salt C₁₅H₁₀I₄NNaO₄ in the treatment of hypothyroidism.
Language periods are conventional ranges, not dates for this word.
Etymograph / levothyroxine