en·do·the·li·um  ( ĕn ′d ō-th ēl ē- əm)
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n. pl. en·do·the·li·a (-l ē- ə) A thin layer of flat epithelial cells that lines serous cavities, lymph vessels, and blood vessels.
en′do·theli·al, en′do·theli·oid′ adj. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
Indo-European Roots
Semitic Roots
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.
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