rowel

English Thesaurus

1. a small spiked wheel at the end of a spur (noun.artifact)

hypernym	:	wheel,
definition	:	a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines) (noun.artifact)

part meronym	:	gad, spur,
definition	:	a sharp prod fixed to a rider's heel and used to urge a horse onward (noun.artifact)