"Endotheca" Natural Recordings by Native Speakers
Endotheca refers to the inner unseen surface or lining of something, such as a cavity, container, or organ. It is often used in biological contexts to describe the lining of a cavity or tube, such as the endotheca of a blood vessel or the endotheca of the uterus.
Endosymbiotic refers to a symbiotic relationship in which one organism lives within the cells or tissues of another organism.