noun, plural callosities.
a callous condition.
Botany. a hardened or thickened part of a plant.
Pathology, callus ( def 1a ).

1375–1425; late Middle English calosite < Late Latin callōsitās, equivalent to callōs(us) callous + -itās -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
callosity (kəˈlɒsɪtɪ)
n , pl -ties
1.  hardheartedness
2.  another name for callus

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

callosity cal·los·i·ty (kə-lŏs'ĭ-tē)
A localized thickening and enlargement of the horny layer of the skin. Also called callus, keratoma, poroma, tyloma.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
No significant plantar callosity formation was noted.
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