American Heritage Dictionary
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
Elsewhere on the web
Would you believe I once saw the word "calumniator" in a blog thread?— problemchildbride.com Blog
The host said something like "you're a calumniator, so I'm banning you."— problemchildbride.com Blog
I confess that I have in response on one occasion descended to abuse of my calumniator, at which he complained and demanded moderation.— open Democracy News Analysis - Comments

Century Dictionary (1)
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Bubble size: how much this word was used in a year
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You can expect to see this word about twice a year.
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