Fĕr'rule, n.

(fĕr'rĭl, or fĕr'rul) (Synop., § 130), n. [Lat. ferrum, iron.]

1. A ring of metal put round a cane, tool-handle, or other thing, to strengthen it, or prevent splitting.
2. (Steam-boilers.) A bushing for expanding the end of a flue.