ep·i·the·li·um

[ep-uh-thee-lee-uhm]
noun, plural ep·i·the·li·ums, ep·i·the·li·a [-lee-uh] . Biology.
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:
1740–50; < Neo-Latin < Greek epi- epi- + thēl() teat + Neo-Latin -ium -ium

ep·i·the·li·al, adjective
in·ter·ep·i·the·li·al, adjective
non·ep·i·the·li·al, adjective
sub·ep·i·the·li·al, adjective
un·ep·i·the·li·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To epithelium
00:10
Epithelium is always a great word to know.
So is callithumpian. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
epithelium (ˌɛpɪˈθiːlɪəm) [Click for IPA pronunciation guide]
 
n , pl -liums, -lia
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]
 
epi'thelial
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

epithelium
Mod.L., from Gk. epi upon + thele teat, nipple (see fecund). Related: Epithelial.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

epithelium ep·i·the·li·um (ěp'ə-thē'lē-əm)
n. pl. ep·i·the·li·ums or ep·i·the·li·a (-lē-ə)
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.


ep'i·the'li·al adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
epithelium   (ěp'ə-thē'lē-əm)  Pronunciation Key 
Plural epithelia
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

epithelium

in anatomy, layer of cells closely bound to one another to form continuous sheets covering surfaces that may come into contact with foreign substances. Epithelium occurs in both plants and animals

Learn more about epithelium with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The vestibular membrane is thin and homogeneous, and is covered on its upper
  and under surfaces by a layer of epithelium.
It is lined by stratified squamous epithelium, which becomes transitional near
  the bladder.
Cervical cancer develops in the thin layer of cells called the epithelium,
  which cover the cervix.
And areas surrounding the stroma produce growth factors that may stimulate the
  epithelium to turn cancerous, she adds.
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