Definition of epithelium in US English:

epithelium

noun

Anatomy
  • 1The thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures.

    • ‘Breakdown of the corneal epithelium increases the risk of stromal surface infection.’
    • ‘Eighty-five percent of human ovarian tumors arise from the epithelium or surface layer of tissue that surrounds the ovaries.’
    • ‘A flattened layer of epithelium was seen lining the cyst in certain areas.’
    • ‘Each tonsil has an irregular number of ingrowths of the surface epithelium known as tonsillar crypts.’
    • ‘The lining epithelium was often eroded, and the underlying stroma showed dense infiltration by inflammatory cells.’
    1. 1.1 The part of the epithelium derived from embryonic ectoderm and endoderm, as distinct from endothelium and mesothelium.

Origin

Mid 18th century: modern Latin, from epi- ‘above’ + Greek thēlē ‘teat’.

Pronunciation

epithelium

/ˌɛpəˈθiliəm//ˌepəˈTHēlēəm/