The story
From meth(yl) + -o- + hex(ynyl) + (secobarb)ital.
Etymology from Wiktionary, CC BY-SA 4.0.
methohexital
Today it means: A derivative of barbituric acid, used, as the sodium salt (more fully sodium methohexital), as a short-acting intravenous anesthetic; (1-methyl-5-allyl-5-[1-methyl-2-pentynyl])barbituric acid, C₁₄H₁₈N₂O₃. Full definition →