/ˈintəmə/
Noun, pl. intimae or intimas
1. The innermost part of an anatomical structure, particularly a tubular one: the intima of a blood vessel. (wiktionary.org)
2. Inner layer of blood vessel, comprising an endothelial monolayer on the luminal face with a subcellular elastic extracellular matrix containing a few smooth muscle cells.
Below the intima is the media, then the adventitia. The term may be applied to other organs. (biology-online.org)
3. The innermost membrane of an organ (especially the inner lining of an artery or vein or lymphatic vessel). (wordnetweb.princeton.edu)