One of the mysteries of the English language finally explained.
Designating a branch of the internal thoracic artery which supplies the pericardium, the diaphragm, and the pleura. Also: designating the accompanying vein, which is a tributary of the internal thoracic vein.
Late 19th century; earliest use found in The Century Dictionary. From pericardiac + -o- + phrenic, after scientific Latin pericardiacophrenicus.
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