ferrule UK /ˈfɛɹ.(ə)l/US /ˈfɛɹ.əl/noun 7verb 1forms 3 noun7 •A band or cap (usually metal) placed around a shaft to reinforce it or to prevent splitting.He walked on, waiting to be spoken to, trailing his ashplant by his side. Its ferrule followed lightly on the path, squealing at his heels. — 1922 •The metal spike at the end of the shaft of an ice axe. •A band holding parts of an object together. •A bushing for securing a pipe joint.Lead pipe is usually wiped to caulking ferrules so it can be joined to another type of material. Ferrules must be made of red brass. — 2003 •A metal sleeve placed inside a gutter at the top. •The plastic band attaching the tip to the cue. •The pinched metal band which holds the bristles of a paintbrush or the eraser of a pencil to the shaft; a similar band crimped as part of a cable terminal or to terminate a hose. verb1 •To equip with a ferrule.I employed a practical boiler smith, who expanded and ferruled the tubes. — 1902 formsferruled · ferruling · ferrules