/ juːˈtrɒfɪk; NAmE -ˈtrɑːf-/ adjective
( technical ) ( of a lake, river, etc. ) containing too many food substances that encourage plants to grow, which then kill animal life by using too much oxygen from the water
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WORD ORIGIN
early 18th cent. (denoting a medicine promoting good nutrition): from Greek eutrophia , from eu well + trephein nourish. The current sense dates from the 1930s.