What adjective describes something that is able to burn or eat away by chemical action?

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The term that describes something capable of burning or eating away by chemical action is "caustic." This adjective specifically refers to substances that can cause destruction or corrosion through a chemical process, such as strong acids or bases. In contrast, the other adjectives do not convey this meaning: "harmless" suggests that something poses no risk or danger, "blunt" refers to an object lacking a sharp edge or point, and "gentle" indicates a soft or mild manner that does not imply any abrasive or destructive qualities. Therefore, "caustic" is the correct and precise term for substances that chemically corrode or burn materials.