ferrule

[fer-uhl, -ool]
noun
1.
a ring or cap, usually of metal, put around the end of a post, cane, or the like, to prevent splitting.
2.
a short metal sleeve for strengthening a tool handle at the end holding the tool.
3.
a bushing or adapter holding the end of a tube and inserted into a hole in a plate in order to make a tight fit, used in boilers, condensers, etc.
4.
a short ring for reinforcing or decreasing the interior diameter of the end of a tube.
5.
a short plumbing fitting, covered at its outer end and caulked or otherwise fixed to a branch from a pipe so that it can be removed to give access to the interior of the pipe.
6.
Angling.
a.
either of two fittings on the end of a section of a sectional fishing rod, one fitting serving as a plug and the other as a socket for fastening the sections together.
b.
one of two or more small rings spaced along the top of a casting rod to hold and guide the line.
verb (used with object), ferruled, ferruling.
7.
to furnish with a ferrule.
Also, ferule.


Origin:
1605–15; alteration (apparently conformed to Latin ferrum iron, -ule) of verrel, verril, late Middle English virole < Middle French (cognate with Medieval Latin virola) < Latin viriola, equivalent to viri(a) bracelet + -ola -ole1

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Collins
World English Dictionary
ferrule or ferule (ˈfɛruːl, -rəl, ˈfɛruːl, -rəl)
 
n
1.  a metal ring, tube, or cap placed over the end of a stick, handle, or post for added strength or stability or to increase wear
2.  a side opening in a pipe that gives access for inspection or cleaning
3.  a bush, gland, small length of tube, etc, esp one used for making a joint
 
vb
4.  (tr) to equip (a stick, etc) with a ferrule
 
[C17: from Middle English virole, from Old French virol, from Latin viriola a little bracelet, from viria bracelet; influenced by Latin ferrum iron]
 
ferule or ferule
 
n
 
vb
 
[C17: from Middle English virole, from Old French virol, from Latin viriola a little bracelet, from viria bracelet; influenced by Latin ferrum iron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

ferrule
"metal cap on a rod," 1410, from O.Fr. virelle, from L. viriola "bracelet," dim. of viriæ "bracelets," from a Gaulish word (cf. O.Ir. fiar "bent, crooked"); spelling infl. by L. ferrum "iron."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for ferrules
Wires with metal ferrules at each end were place in the holes to make connections.
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