any plant or animal tissue that covers a surface or lines a cavity, and that also performs any of various secretory, transporting, or regulatory functions.
- ep·i·the·li·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use epithelium in a sentence
After the first poisoning, the epithelia are permanently injured and remain more permeable to protein.The Treatment of Hay Fever | George Frederick Laidlaw
The pus-corpuscles which eventually appear originate mainly from transformed epithelia.
Between these chambers the separating strata of epithelia are compressed so as to form septa or partition walls.
Mucus is a viscid fluid secreted by the gland-cells, or epithelia.A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition) | Calvin Cutter
The epithelia of the rete mucosum are swollen and stretched.
British Dictionary definitions for epithelium
an animal tissue consisting of one or more layers of closely packed cells covering the external and internal surfaces of the body. The cells vary in structure according to their function, which may be protective, secretory, or absorptive
- epithelial, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for epithelium
The thin, membranous tissue that lines most of the internal and external surfaces of an animal's body. Epithelium is composed of one or more layers of densely packed cells. In vertebrates, it lines the outer layer of the skin (epidermis), the surface of most body cavities, and the lumen of fluid-filled organs, such as the gut or intestine.
- epithelial adjective
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.