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n. pl. en·do·the·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; see dhē(i)- in the Appendix of Indo-European roots.] en′do·theli·al, en′do·theli·oid′ adj. |
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