Ferrule (noun)
fe-rool
ring or cap, usually of metal, put around the end of something, a pipe, or cane, or the like, to prevent splitting or reinforce.
1605–15; alteration (apparently conformed to Latin ferrum iron, -ule) of verrel, verril,late Middle English virole
Example sentences
“The metal detectorist found a ferrule from the end of something wood that had rotted away.”