blade
Definitions
The flat cutting part of a knife, sword, or tool.
A single leaf of grass or a similar long, narrow leaf.
The broad, flat part of an oar or a propeller.
Examples
The chef sharpened the blade of his knife before starting to chop the vegetables.
A single blade of grass poked through the crack in the concrete sidewalk.
The ice skater glided gracefully across the rink on the thin steel blade of her skate.