razor blade

Meaning

1. A thin piece of steel with a sharp edge that can be fitted into a razor.
2. A replaceable cartridge in which razor blades are set, fitted into a razor.
3. A thin interchangeable blade for a utility knife (especially, that of a Stanley knife) that is similar to a razor blade stricto sensu (in size, thinness, and sharpness).
4. Alternative form of razor-blade.

Sources

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