From Longman Dictionary of Contemporary Englishferrulefer‧rule /ˈferuːl, ˈferəl $ ˈferəl/ noun [countable] technical a piece of metal or rubber put on the end of a stick to make it stronger
Examples from the Corpus
ferrule• The staff itself is of snakewood, tipped with two inch deep silver ferrules.• It seemed he had just lost the ferrule of his stick.• The umbrella fell to the floor with a sharp crack of the ferrule on the tile.• The use of plastic also means that the ferrule will not rust or discolour.• The ferrule was well-formed, with no sharp edges.Origin ferrule (1600-1700) verrel ((15-19 centuries)) (influenced by Latin ferrum “iron”), from Latin viriola “small band worn around the arm” 