also: ブレイド
noun
Refers to the flat cutting part of a knife, sword, razor, or similar tool. Also used for blade-like parts in machinery, sports equipment, and as a metaphorical term.
このナイフのブレードはとても鋭い。
The blade of this knife is very sharp.
スケートのブレードを研いでもらった。
I had the blades of my skates sharpened.