n., pl., -li·a (-lē-ə).
A thin layer of flat epithelial cells that lines serous cavities, lymph vessels, and blood vessels.
[New Latin endothēlium : ENDO- + Greek thēlē, nipple.]
endothelial en'do·the'li·al or en'do·the'li·oid' adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
