eli5: Why do some chemical compounds have “poly” in the name?

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I understand that poly means “many” or something along those lines. But whenever I hear something with poly in the name it feels like it gives literally no additional info other than it has two or more of something. Is it more than a specified number? I’m confused.

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Anonymous 0 Comments

“Poly” in a chemical name usually mean you’re making a chain of some kind.

For example: ethylene is a C2H4. Polyethylene is chains of that, often separated by carbon or nitrogen in a way that allows the chains to branch.

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