[1] : The Collaborative International Dictionary of English v.0.48

callosity \callos"ity\, n.; pl. callosities. l. callasitas;
   cf. f. calost'e.
   a hard or thickened spot or protuberance; a hardening and
   thickening of the skin or bark of a part, eps. as a result of
   continued pressure or friction.
   1913 webster
see also:
callosities 

[2] : WordNet (r) 2.0

callosity
     n : an area of skin that is thick or hard from continual
         pressure or friction as the sole of the foot syn: callus
see also:
callus 

Callosity >> C Words
Callosity, definition of term: Callosity
callosity_pag1.html