ferrule
Concise Oxford English Dictionary © 2008 Oxford University Press:
ferrule /ˈfɛruːl, ˈfɛr(ə)l/
▶noun a ring or cap which strengthens the end of a handle, stick, or tube.
■ a metal band strengthening or forming a joint.
– origin C17: alt. (prob. by assoc. with L. ferrum ‘iron’) of obs. verrel, from OFr. virelle, from L. viriola, dimin. of viriae ‘bracelets’.
'ferrule' also found in these Oxford entries:
