noun🔗ShareÉpithéliumA membranous tissue composed of one or more layers of cells which forms the covering of most internal and external surfaces of the body and its organs: internally including the lining of vessels and other small cavities, and externally being the skin."The doctor examined the tissue sample to see if the epithelium was healthy. "Le médecin a examiné l'échantillon de tissu pour voir si l'épithélium était sain.medicinephysiologyanatomyorganbodybiologyscienceChat with AIVocabulary GamePractice Reading