safety device

English Thesaurus

1. a device designed to prevent injury or accidents (noun.artifact)

hypernym	:	device,
definition	:	an instrumentality invented for a particular purpose (noun.artifact)

hyponym	:	fender,
definition	:	a low metal guard to confine falling coals to a hearth (noun.artifact)

hyponym	:	safety catch, safety lock,
definition	:	guard consisting of a locking device that prevents a weapon from being fired (noun.artifact)