'restrictor' originates from the Latin word 'restrictus,' which is the past participle of 'restringere,' meaning 'to bind fast or confine.'

'restrictus' transformed into the Old French word 'restreindre,' and eventually became the modern English word 'restrict' and its derivative 'restrictor.'

Initially, it meant 'to bind or confine,' but over time it evolved into its current meaning of 'a device that limits or controls.'