- piezomagnetic effect
- pigtail
- pill
- pilot plant
- pilot relaying
- pin jack
- pipe duct
- piping arrangement
- Pirani gage
- piston attenuator
- piston clearance
- pitometer
- pitting
- plane capacitor
- plane reflector
- planetary motion
- planetary nebulae
- planoconcave
- planoconvex
- plasma beam
- plasma physics
- plastic capacitor
- physical acoustics
- physical optics
- physiological acoustics
- PID regulator
- piezoelectric generator
- piezoelectric material
- piezomagnetic
- piezometry
- pilot wire
- pipe battery
- pipe flow
- piping system
- plate absorber
- plate electrode
- plate fin
- plate hardener
- plate packing
- plateau
- platform
- pleiad
- pleochroism
- plotting paper
- plug braking
- plug connector
- plug flow
- plug fuse
- plumbago
- plumbiferous
- Planck function
- plane beam
- plane earth
- plane polarization
- planimeter
- planoconvex spotlight
- plasma oscillation
- plate cooler
- plate freezing
- plate vibration
- player
- plumbing
- plural scattering
- plenum system
- plug
- plug valve
- plugging
- pluriharmonic
- plurisubharmonic
- plus tapping
- pluviometer
- PMOS transistor
- pneumatic
- pneumatic comparator
- pneumatic controller
- pneumatic quantities
- pneumatic sprayer
- Pockels cell
- Pockels effect
- pitch factor
- pivoting ventilator
- planetary electron
- Plank cycle
- plasma column
- plastic foam
- plasticizer
- plate ice
- plateau length
- plated
- Poincare electron
- point adjuster
- point diode
- point effect
- point particle
- point recorder
- point target
- point transposition
- pointing error
- poisonous refrigerant
- polar