noun, plural cal·los·i·ties.
Examples from the Web for callosity
A callosity is a circumscribed thickening of the stratum cornium.Surgery, with Special Reference to Podiatry|Maximilian Stern
On the knee is a callosity, or round patch of bare hardened skin.Unexplored Spain|Abel Chapman
He wonders why a bare patch, and not a callosity, should not result from this innate, apparently hereditary habit.
To a youth afflicted with the callosity of sentiment, this quaint and pregnant saying appeared merely base.The Works of Robert Louis Stevenson, Volume 9|Robert Louis Stevenson
A callosity forms and suppuration occurs under it, the pus escaping through a small hole in the centre.Manual of Surgery|Alexis Thomson and Alexander Miles