Definition of peri- in English:

peri-

prefix

2 Astronomy Denoting the point nearest to a specified celestial body: perihelion perilune Compare with apo-.

Origin

from Greek peri 'about, around'.

Definition of peri- in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous