(chemistry) The strong base Ra(OH)₂ obtained when radium reacts with water; it has no commercial use

(inorganic chemistry) The base Mg(OH)₂ that occurs naturally as brucite; it is used as an antacid and in many industrial processes

(inorganic chemistry) The alkaline base KOH, once known as caustic potash; it has a number of industrial uses, including the manufacture of bleach.

(organic chemistry) The quaternary ammonium base (CH₃)₄N⁺ OH⁻

(organic chemistry) Synonym of ethanol

(organic chemistry) Synonym of methanol