sodium hydroxide

This term refers to a highly corrosive chemical base. In professional laboratory and industrial settings, it is the standard technical name, whereas "lye" or "caustic soda" are more common in domestic or traditional contexts, such as soap making or drain cleaning.

Because it is a chemical compound, it is treated as an uncountable mass noun. It does not have a plural form in standard chemical nomenclature; instead, quantities are specified using units of measurement or phrases like "samples of sodium hydroxide."