The Collaborative International Dictionary of English v.0.48:
Periergy \Per"i*er`gy\, n. [Gr. ?, fr. ? overcareful; peri`
about, beyond + ? work.]
1. Excessive care or diligence. [Obs.]
[1913 Webster]
2. (Rhet.) A bombastic or labored style. [R.]
[1913 Webster]