pentamethonium
noun
pen·ta·me·tho·ni·um
| \ ˌpent-ə-me-ˈthō-nē-əm
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Medical Definition of pentamethonium
: an organic ion [C11H28N2]2+ used in the form of its salts (as the bromide and iodide) for its ganglionic blocking activity in the treatment of hypertension