Meaning of -ATOR in English

-ATOR

-ator /eɪtə $ -ər/ BrE AmE suffix [in nouns]

[ Language: Old French ; Origin: -atour , from Latin -ator ]

someone or something that does something:

a narrator (=someone who tells a story)

a generator (=a machine that produces electricity)

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.