razor blade 
noun
A blade used in a razor, typically a flat piece of metal with a sharp edge or edges used in a safety razor.When the first person laid the sharp edge of a razor blade on my stomach, I didn't even flinch....
- Wieder remembers cutting mats using a razor blade and a straight edge.
- Not only the thorns, but also the petals are sharper than a razor blade.
- reversible
- reversible error
- reversible falls
- reversible-pitch
- reversibly
- reversify
- reversing falls
- reversing gear
- reversing lamp
- reversing layer
- reversing lever
- reversing light
- reversingly
- reversing propeller
- reversing thermometer
- reversion
- reversional
- reversionary
- reversionary bonus
- reversion clause
- reversion disease
- reversion duty
- reversioner
- reversion spectroscope
- reversis