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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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
The reuse of an existing ferrule on a newly installed service line will no longer be allowed.
These are some typical examples of wire snare the swivel from binding against the end ferrule made out of wire.
The latch ferrule in the egg trays can be easily installed by simply gluing a new one in place.
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