Definition of endothelium in English:

endothelium

noun

Anatomy
  • [mass noun] The tissue which forms a single layer of cells lining various organs and cavities of the body, especially the blood vessels, heart, and lymphatic vessels. It is formed from the embryonic mesoderm.

    Compare with epithelium
    • ‘The endothelium is a layer of cells that line the undersurface of the cornea and are essential to keeping the cornea clear.’
    • ‘This endothelium helps give vessels the elasticity needed to regulate blood pressure.’
    • ‘The pulmonary endothelium represents a very large surface area, the major part of which lies in close contact with the alveoli.’
    • ‘Laughter appears to cause the tissue that forms the inner lining of blood vessels, the endothelium, to dilate or expand in order to increase blood flow.’
    • ‘Blood vessels only work when both endothelia and vascular smooth muscle are bound together.’

Origin

Late 19th century: modern Latin, from endo- ‘within’ + Greek thēlē nipple.

Pronunciation:

endothelium

/ˌɛndə(ʊ)ˈθiːlɪəm/