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

Many are packed with nourishing ingredients like hyaluronic acid, caffeine, peptides, and antioxidants, so coverage feels more like an extension of your skin-care routine than an extra layer sitting on top. — Christa Joanna Lee, Allure, 14 Aug. 2026

Look for formulas that also contain ingredients like hyaluronic acid and niacinamide to help hydrate skin and blur uneven or discolored areas. — Alanna Martine Kilkeary, Glamour, 13 Aug. 2026

Courtesy of David Jack From retinol and vitamin C to hyaluronic acid and peptides, the beauty industry appears to always be searching for the next breakthrough ingredient. — Laia Farran Graves, Forbes.com, 12 Aug. 2026

Why the two ingredients are not really rivals The framing of collagen versus hyaluronic acid misses what each is doing. — Lauren Jarvis-Gibson, Sacbee.com, 10 Aug. 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