Browse the Concise Encyclopedia
- planarian
- plane tree
- planer
- planet
- planetarium
- planetary nebula
- planetesimal
- plankton
- plant
- plant virus
- plantagenet, house of
- plantain
- plasma
- plasmid
- plasmodium
- plaster of paris
- plastic surgery
- plasticity
- plastics
- plata, río de la
- plataea
- plataea, battle of
- plate tectonics
- plateau
- plateau indian
- platelet
- plateresque
- platform tennis
- plating
- platinum
- platonic solid
- platonism
- platoon
- platt amendment
- platypus
- play
- playa
- player piano
- playing cards
- plea bargaining
- plebeian
- plebiscite
- pleiades
- pleistocene epoch
- plessy v. ferguson
- pliocene epoch
- ploidy
- plover
- plow
- plum
- plumbing
- pluralism
- plurality system
- pluto
- plutonium
- plymouth company
- plywood
- pneumatic device
- pneumatic structure
- pneumococcus
- pneumoconiosis
- pneumonia
- pneumothorax
- pocket mouse
- podesta
- podiatry
- podium
- poet laureate
- poetry
- pogrom
- poinsettia
- point four program
- pointer
- pointillism
- poison
- poison hemlock
- poison ivy
- poison oak
- poison sumac
- poitiers, battle of
- poitou
- poker
- pokeweed
- poland, partitions of
- polar bear
- polar wandering
- polaris
- polarization
- polaroid corp.
- pole construction
- pole vault
- polecat
- police
- police power
- poliomyelitis
- polis
- polisario front
- polish corridor
- polish language
- polish succession, war of the