1. A normal condition of nutrition and health, with regular development of the total organism.
3. In ecology, with reference to lakes or ponds, characterized by an abundant accumulation of nutrients that support a dense growth of algae and other organisms, the decay of which depletes the shallow waters of oxygen in summer: "Eutrophic waters (lakes or ponds) are rich in mineral and organic nutrients which promote a proliferation of plant life; especially, algae, that reduces the dissolved oxygen content and often causes the extinction of other organisms."