To be broken down by natural biological processes (like bacteria) into harmless natural substances.
Verb form from bio- (life) + degrade (break down). Coined in 1960s as environmental movement needed terminology for how materials break down in nature versus persisting as pollution.
When companies say their packaging 'biodegrades,' they mean bacteria will actually eat it. But 'biodegradable' doesn't always mean it'll break down in a landfill—it might only work in industrial composting facilities where conditions are perfect.
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