English
irradiator
From irradiate + -or.
Formed from irradiate + -or
Latin radius ‘ray of light’
Latin radiō ‘to cause to radiate, irradiate’
Medieval Latin irradiātus
Middle English irradiate ‘illuminated, shining’
English irradiate
Today it means
noun A device used to irradiate.
Language periods are conventional ranges, not dates for this word.
Etymograph / irradiator