blade

blade /bl'eɪd/ (blades)
1 [N-COUNT]
The blade of a knife, axe, or saw is the edge, which is used for cutting.
Many of these tools have sharp blades, so be careful.
2 [N-COUNT] usu pl
The blades of a propeller are the long, flat parts that turn round.
3 [N-COUNT]
The blade of an oar is the thin flat part that you put into the water.
4 [N-COUNT]
A blade of grass is a single piece of grass.
5
rotor blade: see rotor
see also razor blade, shoulder bladera|zor blade (razor blades)
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A razor blade is a small flat piece of metal with a very sharp edge which is put into a razor and used for shaving.shoul|der blade (shoulder blades)
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Your shoulder blades are the two large, flat, triangular bones that you have in the upper part of your back, below your shoulders.

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