1. through; all over: perforation | pervade | percuss.

全面的に

completely; very: perfect | perturb.

完全に、非常に

to destruction; to ill effect: perdition | pervert.

破壊、害、病的影響、悪影響の方へ

2. #Chemistry having the maximum proportion of some element in combination: peroxide | permanganate | perchloric.

(化)過... e.g. peroxide: 過酸化物

from Latin (see per).