Recent Examples on the WebIndia imports four types of fertilisers: urea, diammonium phosphate (DAP), muriate of potash (MOP) and nitrogen-phosphorous-potassium (NPK). Mimansa Verma, Quartz, 7 Mar. 2022 There are a few different kinds of potash, but the one that's deposited extensively beneath Michigan is potassium chloride (KCl), known as muriate of potash or MOP. Keith Matheny, Detroit Free Press, 16 Mar. 2018
Word History
Etymology
French, back-formation from (acide) muriatique muriatic acid