Definition of peri- in English:

peri-

Syllabification: peri-

prefix

1Around; about: pericardium perimeter peristyle
2 Astronomy Denoting the point nearest to a specified celestial body: perihelion perilune Compare with apo-.

Origin

from Greek peri 'about, around'.

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Word of the day punctum
Pronunciation: ˈpʌŋ(k)təm
noun
a small, distinct point