pond scum

Noun
  1. Free-floating freshwater green algae (synset 101413098)
    is a type of: chlorophyte, green algae - algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water
    belongs to: family zygnemataceae, zygnemataceae - pond scums: common freshwater algae forming green slimy masses

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