Pert. to or formed of.

Epithelium.

The mucous membrane lining the pharynx is smooth, like that of the mouth, being covered with a layer of flat epithelial cells. – Physiology and Hygiene for Secondary Schools by Francis M. Walters, A.M.

The epithelial structures may be divided, as to their functions, into two main divisions. – A Practical Physiology by Albert F. Blaisdell

Nor can any difference be discerned between the bioplasm matter of the lowest, simplest, epithelial scale of man's organism and that from which the nerve cells of his brain are to be evolved. – Natural Law in the Spiritual World by Henry Drummond

7. Layer of epithelial cells. – Physiology and Hygiene for Secondary Schools by Francis M. Walters, A.M.