malnutrition Syllabification: (mal·nu·tri·tion)Pronunciation: /ˌmalno͞oˈtriSHən/Translate malnutrition | into French | into German | into Italian | into Spanish Definition of malnutrition noun lack of proper nutrition, caused by not having enough to eat, not eating enough of the right things, or being unable to use the food that one does eat. malnutrition in other Oxford dictionaries Definition of malnutrition in the British & World English dictionary