collagen

noun

col·​la·​gen ˈkä-lə-jən 

: any of a group of fibrous proteins that occur in vertebrates as the chief constituent of connective tissue fibrils and in bones and yield gelatin and glue upon boiling with water

collagenous

kə-ˈla-jə-nəs 

adjective

Examples of collagen in a Sentence

Recent Examples on the Web

And, much like our collagen, the NAD our body naturally produces starts a precipitous decline by our twenties, debilitated by our lifestyle choices and daily stressors (poor diet, not enough exercise, stress, pollution and so on), dipping steadily with age. —Fiorella Valdesolo, Allure, 2 Apr. 2025

The loss of estrogen, in particular, seems to impact collagen loss during perimenopause and menopause. —Ana Morales, Vogue, 2 Apr. 2025

Better skin texture: More collagen may translate to smoother, more radiant skin. —Kathleen Ferraro, Verywell Health, 31 Mar. 2025

This collagen mask should be worn for at least three hours or overnight to deliver an out-of-this-world collagen boost that will leave you skiing looking dewy and feeling supple. —Nora Colomer, FOXNews.com, 27 Mar. 2025

Word History

Etymology

Greek kolla + International Scientific Vocabulary -gen

First Known Use

circa 1865, in the meaning defined above

Rhymes for collagen

• procollagen

Kids Definition

collagen

noun

col·​la·​gen ˈkäl-ə-jən 

: a protein that occurs in the form of fibers, does not dissolve, is found in connective tissue, and forms glue and gelatin upon boiling with water

Medical Definition

collagen

noun

col·​la·​gen ˈkäl-ə-jən 

: an insoluble fibrous protein of vertebrates that is the chief constituent of the fibrils of connective tissue (as in skin and tendons) and of the organic substance of bones and yields gelatin and glue on prolonged heating with water

collagenic

ˌkäl-ə-ˈjen-ik 

adjective

collagenous

kə-ˈlaj-ə-nəs 

adjective