ˈa.lɪ.mənt ˈnɝɪʃmənt njuːˈtɹɪ.ʃən nuˈtɹɪ.ʃən ˈsʌs.tə.nəns ˈvɪtl̩z the scientific study of food and drink (especially in humans) a source of materials to nourish the body (physiology) the organic process of nourishing or being nourished; the processes by which an organism assimilates food and uses it for growth and maintenance