PERICARDIUM
pericardium
(noun) a serous membrane with two layers that surrounds the heart
Source: WordNet® 3.1
Noun
pericardium (plural pericardia)
(anatomy, cardiology) A serous membrane that surrounds the heart allowing it to contract.
Synonyms
• heart sac
• theca cordis
Source: Wiktionary
Per`i*car"di*um, n. Etym: [NL., fr. Gr. (Anat.)
Definition: The double baglike fold of serous membrane which incloses the heart.
Note: The inner layer is closely adherent to the outer surface of the heart, and is called the cardiac pericardium. The outer layer loosely incloses the heart and the adherent inner layer, and is called the parietal pericardium. At the base of the heart the two layers are continuous, and form a narrow closed cavity filled with fluid, in which the pulsations of the heart cause little friction.
Source: Webster’s Unabridged Dictionary 1913 Edition
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