a fungus that grows as soft, often green or fuzzy growth on damp surfaces, or a container shaped to form something into a particular shape.
From Old English 'mold' with uncertain origin, possibly from Old Norse. The fungus sense and the shaping-form sense are related—both involve transformation and taking on a shape.
Penicillin, which revolutionized medicine and has saved millions of lives, was discovered by accident when Alexander Fleming noticed that mould killed bacteria—one of history's greatest discoveries came from someone not cleaning their lab properly!
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