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English definition of “blue-green algae”

blue-green algae

noun [plural]     /ˌbluːˌɡriːnˈæl.ɡiː/
a poisonous type of plant that grows on the surface of lakes in warm weatherWater and marsh plants, bushes and trees
(Definition of blue-green algae noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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