Etymology
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ferrule (n.)

"metal cap on a rod," 1610s, ferule, earlier verrel (early 15c.), from Old French virelle "ferrule, collar" (12c. Modern French virole), from Medieval Latin viriola "bracelet," diminutive of Latin viriae "bracelets," from a Gaulish word akin to Old Irish fiar "bent, crooked," from PIE *wi-ria-, from root *wei- "to turn, twist, bend." Spelling influenced by Latin ferrum "iron."

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Definitions of ferrule

ferrule (n.)
a metal cap or band placed on a wooden pole to prevent splitting;
Synonyms: collet
From wordnet.princeton.edu