blade
n. countablen. the flat, sharp part of a tool or weapon that is used for cutting. It can also describe a single piece of grass or the flat part of an oar or propeller.
n. the flat, cutting edge of a tool, weapon, or machine; by extension, the expanded, flat portion of a leaf or oar.
The chef sharpened the blade of his knife before starting dinner.
The lawnmower needs a new blade because the current one is too dull to cut the grass evenly.
The archaeologist carefully brushed away the dirt to reveal a flint blade, remarkably well-preserved and still possessing a jagged, lethal edge after thousands of years underground.
From Middle English blade, blad, from Old English blæd (“leaf”), from Proto-West Germanic blad, from Proto-Germanic bladą, from Proto-Indo-European bʰl̥h₃-o-to-m, from bʰleh₃- (“to thrive, bloom”). See also West Frisian bled, Dutch blad, German Blatt, Danish blad, Irish bláth (“flower”), Welsh blodyn (“flower”), Tocharian A pält, Tocharian B pilta (“leaf”), Albanian fletë (“leaf”). Similar usage in German Sägeblatt (“saw blade”, literally “saw leaf”). Doublet of blat. More at blow.
Commonly used in compound nouns like 'razor blade', 'saw blade', or 'shoulder blade'.