American Heritage Dictionary
(3)
Century Dictionary
(8)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Here's a little car that's nearly extinct in rust-prone areas.— Jalopnik
Pay particular attention to your callus-prone areas.
Turkey includes one of the more earthquake-prone areas of the world.
Our current system is far more complex; far more black swan prone, and the cascade has most likely merely begun.— BusinessWeek.com --

American Heritage Dictionary (1)
Century Dictionary (1)
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 a few times a week.
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