Akademik

Peri-
Prefix meaning around or about. For example, pericardial is around the heart, and periaortic lymph nodes are lymph nodes around the aorta.
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Around, about, near. Cf.:circum-. [G. around]

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prefix denoting
near, around, or enclosing. Examples: perianal (around the anus); pericardial (around the heart); peritonsillar (around a tonsil).

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[Gr. peri around] a prefix meaning near or around.

Medical dictionary. 2011.