
1) Epithelial tissue 2) Epithelium
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https://www.crosswordclues.com/clue/endothelium

The endothelium is the thin layer of cells that lines the interior surface of blood vessels and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall. The cells that form the endothelium are called endothelial cells. Endothelial cells in direct contact with blood are called vascular...
Found on
http://en.wikipedia.org/wiki/Endothelium

Layer of flattened epithelial cells lining the heart, blood vessels and lymphatic vessels. [
2]
Found on
http://sis.nlm.nih.gov/enviro/iupacglossary/glossarye.html

• (n.) The thin epithelium lining the blood vessels, lymphatics, and serous cavities. See Epithelium.
Found on
http://thinkexist.com/dictionary/meaning/endothelium/

(endo- + Gr. thl nipple) (NA) the layer of epithelial cells that lines the cavities of the heart and of the blood and lymph vessels, and the serous cavities of the body, originating from the mesoderm.
Found on
http://users.ugent.be/~rvdstich/eugloss/DIC/dictio30.html

(from the article `atherosclerosis`) chronic disease caused by the deposition of fats, cholesterol, calcium, and other substances in the innermost layer of endothelium of the large and ... ...four broad groups according to cell composition: epithelial tissues, composed of cells that make up the body`s outer covering and the membranous ....
Found on
http://www.britannica.com/eb/a-z/e/30

A single layer of smooth, flattened cells lining the heart, blood vessels, and lymph vessels. Endothelium is made up of endothelial cells. See also epithelium.
Found on
http://www.daviddarling.info/encyclopedia/E/endothelium.html

<pathology> The layer of epithelial cells that lines the cavities of the heart and of the blood and lymph vessels and the serous cavities of the body, originating from the mesoderm. ... Origin: Gr. Thel = nipple ... (18 Nov 1997) ...
Found on
http://www.encyclo.co.uk/local/20973

(en″do-the´le-әm) pl. endothe´lia the layer of epithelial cells that lines the cavities of the heart and of the blood and lymph vessels, and the serous cavities of the body.
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http://www.encyclo.co.uk/local/21001

Simple squamous epithelium lining blood vessels, lymphatics and other fluid-filled cavities (such as the anterior chamber of the eye). Mesodermally derived, unlike most epithelia.
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http://www.encyclo.co.uk/visitor-contributions.php
En`do·the'li·um noun ;
plural Endothelia . [ New Latin , from Greek
'e`ndon within + ... nipple.]
(Anat.) The thin epithelium lining the blood vessels, lymphatics, and serous cavities. See
Epithelium .
Found on
http://www.encyclo.co.uk/webster/E/39

Type: Term Pronunciation: en′dō-thē′lē-ŭm, -lē-ă Definitions: 1. A layer of flat cells lining, especially blood and lymphatic vessels and the heart.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=29214

Endothelium: A layer of flat cells lining the closed internal spaces of the body such as the inside of blood vessels and lymphatic vessels (that convey the lymph, a milky fluid) and the heart. By contrast, the outside layer of cells that covers all the free, open surfaces of the body including the skin, and mucous membranes that communicate with th...
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http://www.medterms.com/script/main/art.asp?articlekey=3248

(en;do-the;le-um) The layer of epithelial tissue that forms the thin inner lining of blood vessels and heart chambers.
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http://www.mhhe.com/biosci/abio/glossary.mhtml

[
n] - an epithelium of mesoblastic origin
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http://www.webdictionary.co.uk/definition.php?query=endothelium

endothelium The layer of epithelial cells that lines the cavities of the heart, the lumina of blood and lymph vessels, and the serous cavities of the body; it originates from the mesoderm.
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http://www.wordinfo.info/words/index/info/view_unit/729/

the layer of flat cells that lines the blood and lymph vessels, the heart, and other structures in the body
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https://www.encyclo.co.uk/local/20875
noun an epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities
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https://www.encyclo.co.uk/local/20974

Greek endo = within, and thele = the nipple; the squamous epithelium lining the heart and blood vessels.
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https://www.encyclo.co.uk/local/21450

The epithelial cells lining the inside of a blood vessel.
Found on
https://www.encyclo.co.uk/local/22445

a type of epithelium composed of a single layer of smooth, thin cells that lines the heart, blood vessels, lymphatics, and serous cavities.
Found on
https://www.infoplease.com/dictionary/endothelium

the cells or membrane lining organs.
Found on
https://www.stanfordchildrens.org/en/topic/default?id=glossary---digestive-

The smooth inner lining of many body structures, including the heart (endocardium) and blood vessels.
Found on
https://www.texasheart.org/heart-health/heart-information-center/topics/a-z
No exact match found.