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.
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.
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
"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."