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Both. In the older days, "inflammable" meant something that is highly explosive or could catch fire easily. If you think about it, "inflammable" came from the word "inflame".

"Inflammable" came first, though. But someone figured that the prefix "in-" would be confused for "non-flammable", and proposed that the word "flammable" should be used instead.

So wood is flammable, but inflammable isn't wrong either.

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15y ago

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