pentahedral - piling up
- permissible blasting device
- permissible equipment
- permissible explosive
- permissible flame lamp
- permissible lamp
- permissible overload
- permissible pressure
- permissible safety lamp
- permissible speed
- permissive
- Permo-Carboniferous
- Permo-Triassic
- permutation
- permutite
- perofskite
- peroikic
- perorthobituminous
- perovskite
- perpatic
- perpendicular
- perpendicular array
- perpendicular country
- perpendicular displacement
- perpendicular heave
- perpendicular offset
- perpendicular separation
- perpendicular slip
- perpendicular throw
- perpetual snow
- perpetual snow field
- perpetually frozen soil
- perradial
- perrierite
- perryite
- persalic
- persemic
- persilicic
- persist
- persistence
- persistence at depth