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Comprehensive
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Castile soap a fine white hard unscented soap made of olive oil and sodium hydroxide.
caustic soda sodium hydroxide.
lye a corrosive substance, esp. potassium or sodium hydroxide, usu. dissolved in water.
mercerize to treat (cotton thread or cloth) with sodium hydroxide to increase its strength, dye absorption, and luster.
soda any of several sodium compounds, such as sodium carbonate and sodium hydroxide. [1/5 definitions]