1 green water | Definition of green water

green water

noun

Definition of green water

1 : the water in shore on soundings — compare blue water
2 : green sea
3 : an opaque greenish condition of the water in an aquarium that is caused by excessive growth of algae and that is harmless and usually healthful to fishes

First Known Use of green water

1854, in the meaning defined at sense 3

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