Noun
tetramethylammonium (countable and uncountable, plural tetramethylammoniums)
(chemistry) the simplest quaternary ammonium cation (CH3)4N
DNQ-novolac resists are developed by dissolution in a basic solution (usually 0.26N tetramethylammonium hydroxide (TMAH) in water). Source: Internet
Metal-ion-free developers such as tetramethylammonium hydroxide (TMAH) are now used. Source: Internet