American Heritage Dictionary
(5)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(5)
Elsewhere on the web
There was a real danger Sid might spontaneously combust, as Taylor averaged 116 in the first leg.— Blogposts | guardian.co.uk
Anyone who thinks and believes that any human being, least of all an innocent victim of the Holocaust, is worth less than a 6 millionth of a cracker, should immediately self-combust in a conflagration of embarrassment.— Planet Atheism
It is thus BETTER FOR YET ANOTHER KIND OF REASON AS WELL to NOT directly "combust" it --- but, rather, to use it CLOSED-CYCLE to energize fuel cells that then drive electric motors.— Propeller Most Popular Stories
(Mel Kiper Jr. 's hair might spontaneously combust.)— The Fifth Down

American Heritage Dictionary (1)
Century Dictionary (2)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.
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