Learn English – What do you call the green slippery thing formed, due to standing in water

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I want to know the term in English for the green slippery substance formed on things that are standing in water. I can only think of "algae" or preferably "green algae"; these are in the context of science.

But is there any other general word in English used for this green slippery thing? In Hindi we say, Kaayi, so what is Kaayi in English?

Best Answer

A generic word is slime: Slime algae on backyard ponds. This could occur on the surface or on the side of tanks.

slime noun

2. a. A viscous substance or fluid of animal or vegetable origin
(in this sense: 13th century)

[OED]