malm Syllabification: (malm)Pronunciation: /mä(l)m/Definition of malm noun a soft, crumbly, chalky rock, or the fertile loamy soil produced as it weathers. (also malm brick) a fine-quality brick made originally from malm, marl, or a similar chalky clay. Origin: Old English mealm-, of Germanic origin; related to meal2malm in other Oxford dictionaries Definition of malm in the British & World English dictionary