hyaluronic acid

noun

hy·​al·​uron·​ic acid ˌhī(-ə)l-yu̇-ˈrä-nik How to pronounce hyaluronic acid (audio)
: a viscous glycosaminoglycan chiefly of the matrix of tissues that occurs especially in the vitreous humor, umbilical cord, synovial fluid, and loose connective tissue and serves especially as a structural element and lubricant

Examples of hyaluronic acid in a Sentence

Recent Examples on the Web
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Such ingredients include glycerin and hyaluronic acid, which help skin retain moisture. Sandee Lamotte, CNN Money, 21 Oct. 2025 In this weightless serum, it’s paired with vitamin C and niacinamide to brighten and even out skin tone on the hands, as well as hyaluronic acid to plump and hydrate. Deanna Pai, Vogue, 18 Oct. 2025 There’s hydrating hyaluronic acid, caffeine for puffiness, soothing aloe leaf, and green tea for antioxidant protection. Marie Lodi, StyleCaster, 13 Oct. 2025 It’s made of 75% water, plus hydrating aloe vera, hyaluronic acid, glycerin, and antioxidant-rich green tea to keep lips soft and plump. Lily Wohlner, Allure, 10 Oct. 2025 See All Example Sentences for hyaluronic acid

Word History

Etymology

International Scientific Vocabulary

First Known Use

1934, in the meaning defined above

Time Traveler
The first known use of hyaluronic acid was in 1934

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Cite this Entry

“Hyaluronic acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hyaluronic%20acid. Accessed 22 Oct. 2025.

Medical Definition

hyaluronic acid

noun
hy·​al·​uron·​ic acid ˌhīl-yu̇-ˌrän-ik- How to pronounce hyaluronic acid (audio) ˌhī-əl-yu̇- How to pronounce hyaluronic acid (audio)
: a viscous glycosaminoglycan that occurs especially in the vitreous body, the umbilical cord, and synovial fluid and as a cementing substance in the subcutaneous tissue

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