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Word of the Day Wednesday, June 10, 2026

endothelium

/ɛnˈdoʊθiːliəm/ noun · British & US
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What does endothelium mean?

noun

The innermost layer of cells lining the heart, blood vessels, and lymphatic vessels, forming a thin membrane that lines these structures and plays a crucial role in blood clotting and blood pressure regulation.

Example

"The endothelium of the blood vessels helps to regulate blood flow and prevent blood clots from forming."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for endothelium

Rhymes with endothelium

Etymologically related