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Epithelial

[ep-uh-thee-lee-uhm]

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. 2012.
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Epithelial is always a great word to know.
So is integumentary. Does it mean:
sensitive vascular inner mesodermic layer of the skin
outer protective layer or covering of an animal, such as skin or a cuticle
Collins
World English Dictionary
epithelium (ˌɛpɪˈθiːlɪəm)
 
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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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
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