ker·​a·​to·​sis | \ ˌker-ə-ˈtō-səs How to pronounce keratosis (audio) \
plural keratoses\ ˌker-​ə-​ˈtō-​ˌsēz How to pronounce keratosis (audio) \

Definition of keratosis

: an area of skin marked by overgrowth of horny tissue

Other Words from keratosis

keratotic \ ˌker-​ə-​ˈtä-​tik How to pronounce keratosis (audio) \ adjective

Examples of keratosis in a Sentence

Recent Examples on the Web Most of the women in my family have long had keratosis pilaris, too. Frances Solá-santiago,, 13 July 2022 When used medically for treatment of actinic keratosis, the cost of photodynamic therapy may be covered by insurance, but don’t expect your insurance to cover it for acne, rosacea, or skin rejuvenation. Naomi Barr, SELF, 12 May 2022 In addition, frequent and intense stress causes gastric reflux in the vocal cords, which dry out due to the acidity and become covered with bumps (keratosis). Guillaume Jacquemont, Scientific American, 1 Nov. 2021 Many people experience keratosis pilaris (also known as KP), small rash-like bumps that are common on areas like the backs of the arms. April Franzino, Good Housekeeping, 27 Aug. 2021 Now, the little dots on your legs can also be keratosis pilaris (KP), but there is a way to distinguish this condition from some regular dark follicles. Jihan Forbes, Allure, 24 May 2021 While this is the first mask to be released under the SLMD label, the brand does have a full range of products, many targeted towards fighting breakouts and other common conditions like hyperpigmentation and keratosis pilaris. Sarah Midkiff,, 25 Feb. 2021 So what better time than quarantine to address the tiny sebum filled bumps populating my cheeks and keratosis pilaris along my arms? Talia Gutierrez, Glamour, 1 Jan. 2021 The American Cancer Society also said that UV light can cause premature aging and signs of damage such as wrinkles, leather skin, liver spots, actinic keratosis and solar elastosis. Adrianna Rodriguez, USA TODAY, 4 Aug. 2020 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'keratosis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of keratosis

1888, in the meaning defined above

History and Etymology for keratosis

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.

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The first known use of keratosis was in 1888

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Cite this Entry

“Keratosis.” Dictionary, Merriam-Webster, Accessed 2 Oct. 2022.

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More Definitions for keratosis


ker·​a·​to·​sis | \ ˌker-ə-ˈtō-səs How to pronounce keratosis (audio) \
plural keratoses\ -​ˌsēz How to pronounce keratosis (audio) \

Medical Definition of keratosis

1 : a disease of the skin marked by overgrowth of horny tissue
2 : an area of the skin affected with keratosis

Other Words from keratosis

keratotic \ -​ˈtät-​ik How to pronounce keratosis (audio) \ adjective

More from Merriam-Webster on keratosis Encyclopedia article about keratosis


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