The Collaborative International Dictionary
Peri-
Peri- \Per"i-\ [Gr. ?, prep.] A prefix used to signify around, by, near, over, beyond, or to give an intensive sense; as, perimeter, the measure around; perigee, point near the earth; periergy, work beyond what is needed; perispherical, quite spherical.
Douglas Harper's Etymology Dictionary
peri-
word-forming element meaning "around, about, enclosing," from Greek peri (prep.) "around, about, beyond," cognate with Sanskrit pari "around, about, through," Latin per, from PIE *per- (1) "forward, through" (see per).
Wiktionary
peri-
pre. 1 around or surrounding: 2 near: