PERICARDIUM Meaning of PERICARDIUM in English n. (pl. pericardia) the membranous sac enclosing the heart. Derivatives: pericardiac adj. pericardial adj. pericarditis n. Etymology: mod.L f. Gk perikardion (as PERI- + kardia heart) Oxford English vocab. Оксфордский английский словарь. 2012