| The American Heritage® Book of English Usage. |
A Practical and Authoritative Guide to Contemporary English. 1996.
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3. Word Choice: New Uses, Common Confusion, and Constraints
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| § 55. callous / callus |
| Do not confuse the adjective callous (as in Years of dealing with criminals had left her callous) with the noun callus (as in I have a callus on my thumb). You should also be careful not to mix up the verb callous, which means “to make or become callous,” with the verb callus, which means “to form or develop hardened tissue.” | 1 |
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| The American Heritage® Book of English Usage. Copyright © 1996 by Houghton Mifflin Company. All rights reserved. |
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