noun
a type of algae that is typically blue-green in color and can be found in various aquatic environments
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Blue-green algae are a type of bacteria that can be found in bodies of water.
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Watch out for that pond, it's got blue-green algae in it.
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I heard the lake is full of that gross blue-green algae stuff.
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The blue-green algae of negativity was spreading throughout the office.