razor Definition

a keen-edged cutting instrument for shaving or cutting hair

having a sharp narrow back

any of a family (Solenidae) of marine lamellibranch mollusks having a long narrow thin shell

coiled wire fitted with sharp razor edges and used as an obstacle or barrier; also : concertina wire

a small, thin, sharp piece of metal that is used in a razor

—used in various phrases to refer to a dangerous position or a position in which two different things are carefully balanced

very sharp

showing a lot of intelligence or the ability to think quickly

very small or thin

a scientific and philosophical rule that entities should not be multiplied unnecessarily which is interpreted as requiring that the simplest of competing theories be preferred to the more complex or that explanations of unknown phenomena be sought first in terms of known quantities