-ator

-ator

a combination of -ate1. and -or2. that forms nouns corresponding to verbs ending in -ate1, ,denoting a human agent ( agitator; mediator; adjudicator ) or nonhuman entity, especially a machine ( incubator; regulator; vibrator ) performing the function named by the verb.
Compare -tor, -or2.


Origin:
< Latin -ātor, orig. not a suffix, but the termination of nouns formed with -tor -tor from verbs whose stems ended in -ā-; in English, Latin loanwords ending in -ātor have been reanalyzed as derivatives of the past participles in -tus (see -ate1) and a suffix -or (see -or2), and many new English nouns derived from English verbs based on Latin past participles (e.g., vibrator from vibrate)

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
-ator is always a great word to know.
So is lollapalooza. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Collins
World English Dictionary
-ator
 
suffix forming nouns
a person or thing that performs a certain action: agitator; escalator; radiator
 
[from Latin -ātor; see -ate1-or1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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