Literally meaning: “inner heαrt”
Origin: Anc Greek
ενδο-/endo-(= compining form for “inside”, “internal”, “within”)
+ καρδία /kardia (=heart) > derived according Meletios(7th-8th cen AD) probably from verb >κραδαίνω/kradeno (=rattle, rock)
+um =latin suffix that forms singular nouns
Endocardium is the inner layer of tissue that lines the cavities of the heart..