Webster's English Dictionary

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ferrule

1. fer.rule \'fer-*l\ n [alter. of ME virole, fr. MF, fr. L viriola, dim. 
   of viria br]acelet, of Celtic origin; akin to OIr fiar oblique - more at 
   VEER 1: a ring or cap usu. of metal put around a slender shaft (as a cane 
   or a t ool handle) to strengthen it or prevent splitting 2: a short tube or 
   brushing for making a tight joint (as between pipes) 
2. ferrule vt : to supply with a ferrule