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English definition of “blue-green algae”

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blue-green algae

noun [plural] uk   /ˌbluːˌɡriːnˈæl.ɡiː/ us  
a poisonous type of plant that grows on the surface of lakes in warm weather
(Definition of blue-green algae from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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