The word CALLUS is a noun that means the hardened or toughened part of skin, especially an area that has been exposed to constant friction. It is from Latin and has CALLI as its plural form. Another accepted plural form is CALLUSES (AmE or BrE).
Now, there is CALLOUS which means, (of a person), mean, cruel or insensitive.
Because CALLUS and CALLOUS sound alike, they are usually mistaken, one for the other. With the exposé above, however, I’m sure we won’t get it mixed up anymore.
dGrammarQueen Stella Uchechi Nnodi
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