1 knife, cutting edge:
Don't hold the knife by the blade.
2 Literary sword, rapier, sabre, dagger, poniard, stiletto, cutlass, bayonet, knife, penknife, jackknife:
She plunged the blade in up to the hilt.
3 leaf, leaflet, frond, shoot:
The blades of grass were flattened where he had walked.
4 Rather old-fashioned playboy, ladies' man, man about town, fop, dandy:
He was quite a gay blade in his youth.