American Heritage Dictionary
(5)
Century Dictionary
(8)
GNU Webster's 1913
(1)
WordNet
(5)
Elsewhere on the web
"Even a simple callus or blister in a diabetic patient is likely to become infected and can result in necrosis, and result in the need for amputation," she says.— The Herald | HeraldOnline.com - Front
When you get a little sweaty, calluses get a little soft, and it's almost like a rip, a cut on my toe where that callus is.— Brattleboro Reformer Most Emailed
The wound will develop a scab known as a callus, which seals it off to disease and further moisture loss.— ScrippsNews - current events, culture, commentary, community

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You can expect to see this word about twice a year.
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