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1843, from mal- + nutrition.
malnutrition mal·nu·tri·tion (māl'nōō-trĭsh'ən, -nyōō-)n. Poor nutrition because of an insufficient or poorly balanced diet or faulty digestion or utilization of foods.
Inadequate nutrition caused by the lack of a balanced diet or by disorders of the digestive system in which the nutrients from food cannot be absorbed properly.