/ bleɪd; NAmE / noun
1.
the flat part of a knife, tool or machine, which has a sharp edge or edges for cutting
—picture at knife , penknife , scissors , scythe , handsaw
—see also razor blade , switchblade
2.
one of the flat parts that turn around in an engine or on a helicopter :
the blades of a propeller
rotor blades on a helicopter
—picture at helicopter
3.
the flat wide part of an oar (= one of the long poles that are used to row a boat) that goes in the water
—picture at kayak
4.
a single flat leaf of grass
5.
the flat metal part on the bottom of an ice skate
—see also shoulder blade
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WORD ORIGIN
Old English blæd leaf of a plant (also in sense 2), of Germanic origin; related to Dutch blad and German Blatt .