What is Blade ?
Blade is (noun) 1. a sharp cutting part the blades of a pair of scissors Be careful that knife has a very sharp blade. 2. a thin leaf of grass She sat in the shade of an apple tree, chewing a blade of grass. 3. the flat part at the end of a long piece of wood, used for pushing a boat along 4. one arm of a propeller His arm was severed by a propeller blade.
source: Easier English, Student Dictionary Upper Intermediate Level