fer·rule /ˈfɛrəl/
 金屬手杖等的,金屬環,套圈(vt.)裝以金屬鐵


 ferrule
 套接管


 Fer·rule n.  [Sometimes spelled ferule.]
 1. A ring or cap of metal put round a cane, tool, handle, or other similar object, to strengthen it, or prevent splitting and wearing.
 3. Hence: Steam Boilers A bushing for expanding the end of a flue to fasten it tightly in the tube plate, or for partly filling up its mouth.

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 ferrule
      n : a metal cap or band placed on a wooden pole to prevent
          splitting [syn: collet]