pericardium
(noun) a serous membrane with two layers that surrounds the heart
Source: WordNet® 3.1
pericardia
plural of pericardium
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
3 April 2025
(noun) an assemblage of parts that is regarded as a single entity; “how big is that part compared to the whole?”; “the team is a unit”
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