Definition of sodium hydroxide
: a white brittle solid NaOH that is a strong caustic base used especially in making soap, rayon, and paper
First Known Use of sodium hydroxide
Medical Definition of sodium hydroxide
: a white brittle deliquescent solid NaOH that dissolves readily in water to form a strongly alkaline and caustic solution and that is used in pharmacy as an alkalizing agent—called also caustic soda
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