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hexamethonium

[hek-suh-muh-thoh-nee-uhm]

noun Pharmacology.

a compound, C₁₀H₂₄N₂, used in the treatment of severe hypertension to lower blood pressure and increase blood flow by blocking transmission of nerve impulses that constrict blood vessels.

Origin:
1945–50; hexa- + meth(yl) + (amm)onium

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hexamethonium has a plethora of syllables.

So is floccinaucinihilipilification. Does it mean:

the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).

given to using long words.

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hexamethonium

hex·a·me·tho·ni·um