The protective point or knob on the far end of an umbrella, or parasol.
He jabbed the man in the neck with the ferrule of his umbrella. It was quite sharp, because his umbrella has a concealed blade in it.
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An especially sophisticated feral cat.
Ouch, dude! That ferrule just punctured my kneecaps! Ouch...
Ferrule is the metal tip at the top of a pencil, the one that holds the eraser in place. Did you now this because i didnt, i just googled it.