One that acts in a specified manner: radiator.
[Latin -ātor : -ā-, stem vowel of verbs in -āre + -tor, agent n. suff. (later reanalyzed as -ātus, -ate + -or, -or).]
suffix forming nouns
a person or thing that performs a certain action: agitator; escalator; radiator.
[from Latin -ātor; see -ate1 -or1]
a suffix that forms nouns corresponding to verbs ending in -ate1, denoting a human agent (agitator; mediator) or nonhuman entity, esp. a machine (incubator; vibrator) performing the function named by the verb. Compare -tor, -or2.
[< Latin -ātor]