- any animal tissue that covers a surface, or lines a cavity or the like, and that, in addition, performs any of various secretory, transporting, or regulatory functions.
Origin of epithelium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for epithelium
Epithelium: the layer of cells which covers a surface or lines a cavity.Explanation of Terms Used in Entomology
John. B. Smith
Disease is just as liable to begin its work in the fascia and epithelium as any other place.Philosophy of Osteopathy
Andrew T. Still
In stripping the head from the cornea some of the epithelium may be torn off with it.
In this condition the thickness of the epithelium is about 0.025 mm.
The thickness of the epithelium at this stage is about 0.04 mm.
- 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
C18: New Latin, from epi- + Greek thēlē nipple
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
Word Origin and History for epithelium
Online Etymology Dictionary, © 2010 Douglas Harper
- Membranous tissue composed of one or more layers of cells separated by very little intercellular substance and forming the covering of most internal and external surfaces of the body and its organs.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.