per-
/pɜː(r)/prefix
1
- through; all over表示“通过”; “完全”, “彻底”：
percuss
perforation
pervade.
1.1
- completely; very表示“完全”, “十分”; “非常”：
perfect
perturb.
1.2
- to destruction; to ill effect表示“毁坏”, “变坏”：
perdition
pervert.
2
- Chemistry having the maximum proportion of some element in combination【化】表示“高”, “过”, “全”：
peroxide
perchloric
permanganate.
词源
from Latin （see PER）.