noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A thin layer of flat epithelial cells that lines the heart, serous cavities, lymph vessels, and blood vessels.
2. 2
   an epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities wordnet

Synonyms

All synonyms

dermisepidermis

Etymology

From endo- + -thelium, as in epithelium.

Related phrases

blood vessel

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.