| permission spéciale | leave of absence |
| permit de sejour | residence permit |
| Permittivité du vide | Vacuum permittivity |
| permutation | permutation |
| Permutation circulaire | Cyclic permutation |
| permuter | permute |
| perméabilité | permeability |
| perméable | permeable |
| Perméthrine | Permethrin |
| Pernambouc | Pernambuco |
| Pernette du Guillet | Pernette Du Guillet |
| Pernettya | Gaultheria |
| pernicieux | bad |
| Pernik | Pernik Province |
| Perniö | Perniö |
| Pernod | Pernod Fils |
| Pernå | Pernå |
| Pero Lopez de Ayala | Pero López de Ayala |
| Pero Vaz de Caminha | Pêro Vaz de Caminha |
| Peromyscus | Peromyscus |
| Peromyscus maniculatus | Peromyscus maniculatus |
| Peron | Peron |
| Peroryctidae | New Guinean long-nosed bandicoot |
| Peros Banhos | Peros Banhos |
| Peroxisome proliferator-activated receptor | Peroxisome proliferator-activated receptor |
| peroxyde | peroxide |
| peroxyde d'azote | dinitrogen tetroxide |
| Peroxyde d'hydrogène | Hydrogen peroxide |
| Peroxyde de benzoyle | Benzoyl peroxide |
| Peroxynitrite | Peroxynitrite |
| Peroxysome | Peroxisome |
| perpendiculaire | perpendicular line |
| perpendiculairement | at right angles |
| Perperikon | Perperikon |
| Perpignan | Perpignan |
| perplexe | nonplussed |
| perplexité | confusion |
| Perpète | Life |
| perpétration | perpetration |
| perpétuation | perpetuation |
| perpétuel | permanent |
