perh - phos
- perhalide
- perhalocarbon
- perhalohydrocarbon
- perhydride
- perhydrol
- perhydronaphthalene
- peri-bridge
- peri-cyclo
- peri-cyclo compound
- peri-position
- perilla oil
- period
- period of deplection
- periodate
- periodic acid
- periodic chart
- periodic current
- periodic duty
- periodic group
- periodic inspection
- periodic law
- periodic precipitation
- periodic reaction
- periodic system
- periodic table
- periodic test
- periodically varying denier fiber
- periodide
- periodobenzene
- periodocarbon
- periodoethane
- periodoether
- periodoethylene
- periodohydrocarbon
- peripheral screw speed
- peripheral speed
- peripheral-discharge mill
- perish
- perished rubber
- perishing
