noun Etymology: deca- + methylene + -onium Date: circa 1949 a synthetic ion used in the form of either its bromide or iodide salts (C16H38Br2N2 or C16H38I2N2) as a skeletal muscle relaxant; also either of these salts

New Collegiate Dictionary. 2001.

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  • decamethonium — deca·me·tho·ni·um .dek ə mə thō nē əm n a synthetic ion used esp. in the form of its bromide C16H38Br2N2 or iodide C16H38I2N2 as a skeletal muscle relaxant …   Medical dictionary

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