Where does “endocarditis” come from?

endocarditis (Spanish) comes from Spanish endocardio, from Spanish endo-, from Ancient Greek ἔνδον, from Proto-Hellenic éndon, from Proto-Indo-European h₁n̥dóm, from Proto-Indo-European h₁n̥dó, from Proto-Indo-European h₁én — in.

endocarditis (Spanish): endocarditis