blade Definition

1. The cutting part of a knife or sword, etc.
2. The flat, usually long and narrow, part of a leaf, petal or sepal.
3. The wide flat part of an oar, bat or propeller, or of certain tools and devices.
4. A broad flat bone, eg the shoulder blade (scapula).
5. The runner of an ice-skate, that slides on the surface of the ice.
(Brit)
6. slang
A knife or switchblade.
7. The free flat part of the tongue just behind the tip.