1. In medicine, the condition of being in eutrophy: In the article, Jane read that eutrophia designated a normal condition of nutrition and health, with a regular development of the total organism.
2. 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.