\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.

\Pe"ri\, n.; pl. {Peris}. [Per. per[=i] a female genus, a
fairy.] (Persian Myth.)
An imaginary being, male or female, like an elf or fairy,
represented as a descendant of fallen angels, excluded from
paradise till penance is accomplished. --Moore.