Definition of ferrule noun from the Oxford Advanced Learner's Dictionary

 

ferrule

 noun
noun
BrE BrE//ˈferuːl//
 
; NAmE NAmE//ˈferəl//
 
 
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a piece of metal or rubber that covers the end of an umbrella or a stick to protect it Word Origin early 17th cent.: alteration (probably by association with Latin ferrum ‘iron’) of obsolete verrel, from Old French virelle, from Latin viriola, diminutive of viriae ‘bracelets’.
See the Oxford Advanced American Dictionary entry: ferrule