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

In the morning, cleanse, use hyaluronic acid, moisturizer, and SPF. — Ellie Davis, Vogue, 28 Aug. 2026

Glycerin and hyaluronic acid draw in and hold onto moisture, while panthenol conditions and smooths. — Christa Joanna Lee, Allure, 28 Aug. 2026

All Cottonball treatments also include both high- and low-molecular-weight hyaluronic acid. — Kathryn Hopkins, Footwear News, 28 Aug. 2026

In addition to the plumping voluform, the masks also include hyaluronic acid, collagen, and glycerin. — Essence Wiley, InStyle, 26 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