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- (physiology, of a diet) Being deficient in nutrition.
- (geography, of a body of water) Being deficient in plant nutrients, such as nitrogen or phosphorus.
- 1969 July, Fred W. Rabe and Robert C. Wissmar, “Some Effects of Antimycin in an Oligotrophic Lake” in The Progressive Fish-Culturist, volume XXXI, № 3, page 163
of a diet: deficient in nutrition
of a body of water: deficient in plant nutrients
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