hyaluronic acid

noun

hy·​al·​uron·​ic acid ˌhī(-ə)l-yu̇-ˈrä-nik 

: 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

Sun protection and ingredients like retinoids, peptides, hyaluronic acid and vitamin C can help address skin aging on the neck. — Ryan Brennan, Miami Herald, 10 Oct. 2026

The 10% pure L-ascorbic acid works to fight against free radical damage and even out skin tone, while a blend of hyaluronic acid and ceramides helps hydrate skin and fortify the skin barrier. — Deanna Pai, Vogue, 9 Oct. 2026

To boost that dewy look, layer from lightest to heaviest with a light, concentrated hydrating hyaluronic acid serum, followed by a moisturizer and then a barrier repair cream. — Taylor Nicioli, CNN Money, 8 Oct. 2026

Inside, a whopping 10 types of hyaluronic acid—spanning high to ultra-low molecular weights—soak your skin in deep, multi-level hydration. — Christa Joanna Lee, Allure, 7 Oct. 2026

Word History

Etymology

International Scientific Vocabulary

First Known Use

1934, in the meaning defined above

Rhymes for hyaluronic acid

• antacid
• placid

Medical Definition

hyaluronic acid

noun

hy·​al·​uron·​ic acid ˌhīl-yu̇-ˌrän-ik-  ˌhī-əl-yu̇- 

: 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