ker·​a·​to·​sis ˌker-ə-ˈtō-səs How to pronounce keratosis (audio)
plural keratoses ˌker-ə-ˈtō-ˌsēz How to pronounce keratosis (audio)
: an area of skin marked by overgrowth of horny tissue
keratotic adjective

Examples of keratosis in a Sentence

Recent Examples on the Web Use it in the bath or shower to help reduce acne, ingrown hairs, stretch marks, keratosis pilaris, and scarring to boost circulation. Claire Rutter, Rolling Stone, 26 June 2024 Finally, your bumps could also be keratosis pilaris (a.k.a. KP, a.k.a. chicken skin). Melanie Rud, SELF, 19 June 2024 The glycolic and salicylic acid formula tackles everything from ingrown hairs and keratosis pilaris to bacne and discoloration. Jackie Fields, Peoplemag, 17 June 2024 For those with skin conditions such as keratosis pilaris or eczema, Dr. Garshick recommends choosing scrubs specifically designed for these issues. Kiana Murden, Vogue, 14 June 2024 Corneal damage from sunlight, called solar keratosis, can blur vision and be quite painful. Geoffrey Bradford, The Conversation, 12 Mar. 2024 The brand’s resulting body care products, High Roller and Slather, both work to exfoliate and smooth the skin, targeting ingrown hairs and keratosis pilaris (among other texture issues) respectively with ingredients like glycolic acid, willow bark extract, and retinol. Hannah Baxter, Allure, 5 Mar. 2024 This belly oil is also handy for a common skin condition called keratosis pilaris (or KP for short), a.k.a. Brigitt Earley, Allure, 28 Feb. 2024 The scrub visibly decreased our keratosis pilaris after a few weeks. Alyssa Brascia, Peoplemag, 16 Feb. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'keratosis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


borrowed from German Keratose, from Greek kerat-, kéras "horn" + German -ose -osis — more at kerato-

Note: The term was promulgated, if not introduced, by the German physician Hermann Lebert (1813-78) in Ueber Keratose, oder die durch Bildung von Hornsubstanz erzeugten Krankheiten und ihre Behandlung, Breslau, 1864.

First Known Use

1888, in the meaning defined above

Time Traveler
The first known use of keratosis was in 1888

Dictionary Entries Near keratosis

Cite this Entry

“Keratosis.” Dictionary, Merriam-Webster, Accessed 18 Jul. 2024.

Medical Definition


ker·​a·​to·​sis ˌker-ə-ˈtō-səs How to pronounce keratosis (audio)
plural keratoses -ˌsēz How to pronounce keratosis (audio)
: a disease of the skin marked by overgrowth of horny tissue
: an area of the skin affected with keratosis
keratotic adjective

More from Merriam-Webster on keratosis

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