sodium hydroxide (NaOH), a strong alkaline substance used in the manufacture of paint, soap and detergents, or as a drain cleaner.

plural of caustic soda

(dated) Potassium hydroxide.

plural of caustic curve

plural of caustic surface

(chemistry, obsolete) Silver nitrate fused into a stick and used for cauterizing.

A device for applying topical medication containing silver nitrate and potassium nitrate, used for chemical cauterization of the skin.

plural of caustic pencil

quicklime

potash