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- panzer division
- pap smear
- papacy
- papal infallibility
- papal states
- papaw
- papaya
- papeete
- paper
- paper birch
- paper chromatography (pc)
- paper folding
- paphlagonia
- papillomavirus
- papillon
- papua
- papua new guinea
- papuan languages
- papyrus
- pará river
- parabola
- paracel islands
- parachute
- paradox
- paradoxes of zeno
- paraffin wax
- parakeet
- parallax
- parallel bars
- parallel evolution
- parallel postulate
- paralysis
- paramagnetism
- paramecium
- paramount communications
- paranoia
- parapsychology
- parasitism
- parathyroid gland
- parchment
- pardo
- pardon
- parhae
- pari-mutuel
- paria, gulf of
- parícutin
- parilia
- paris
- paris commune
- paris opéra
- paris peace conference
- paris, congress of
- paris, treaty of
- paris, university of
- paris-match
- parity
- park
- parkinsonism
- parlement
- parliament
- parliament act of 1911
- parliament, canadian
- parliamentary democracy
- parliamentary procedure
- parnassian
- parnassus, mt.
- parochial education
- parody
- parole
- parrhasius
- parrot
- parrot fish
- parsec
- parshvanatha
- parsi
- parsley
- parsnip
- parson's cause
- parterre
- parthenon
- parthia
- parti québécois
- partial derivative
- partial differential equation
- particle accelerator
- particle physics
- parting
- partnership
- partridge
- parturition
- party system
- parvati
- pas de deux
- pasargadae
- pascal
- pascal's law
- pascal's wager
- pashtun
- passage, rite of
- passamaquoddy bay