What is the meaning of blade?

noun

• Especially a leaf of grass or the broad portion of a leaf as distinct from the petiole.
  • synonyms: leaf blade
• A dashing young man.
  • usage: "gay young blades bragged of their amorous adventures"
• Something long and thin resembling a blade of grass.
  • usage: "a blade of lint on his suit"
• A cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard.
  • synonyms: sword, brand, steel
• A cut of beef from the shoulder blade.
• A broad flat body part (as of the shoulder or tongue. )
• The part of the skate that slides on the ice.
• Flat surface that rotates and pushes against air or water.
  • synonyms: vane
• The flat part of a tool or weapon that (usually) has a cutting edge. .