A metal ring or cap placed around the end of a tool handle to prevent splitting and reinforce it.
From Old French 'virole,' derived from Latin 'virola' meaning ring or ferrule. The spelling 'ferrel' is an older variant of the modern spelling 'ferrule,' with the word's form shifting slightly as it moved through European languages.
The ferrule is such a clever example of engineering hiding in plain sight—that tiny metal band on your pencil or axe handle prevents catastrophic splitting by distributing force around the wood, saving tools from destruction. Ancient craftspeople discovered this principle long before materials science could explain it!
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