PERI- Meaning of PERI- in English ■ prefix1》 round; about: pericardium.2》 Astronomy denoting the point nearest to a specified celestial body: perihelion. Compare with apo- .Originfrom Gk peri 'about, around'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004