- p ... P.S.1 Contemporary Art Center
- P/51 rifle ... Pacetti, Camillo
- Pach, Walter ... Pacific Northwest Ballet
- Pacific Northwest Indian ... packing proximity
- packrat ... paedogenesis
- paedomorphism ... paging
- Paging Mr. Proust ... painkiller
- Painlevé, Paul ... Paitishhahya
- Paiute ... Palabra del mudo
- Palabras en la arena ... Palaquium oblongifolia
- Palar River ... Paleo-Siberian languages
- paleoanthropology ... palila
- palilalia ... Palm City
- palm civet ... Palmer, Samuel
- Palmer, Sandra ... Pamir argali
- Pamir River ... Pan-African congresses
- Pan-African episode ... pañc-piāra
- pañca-parameṣṭhin ... Pandey, Mangal
- Pandharpur ... Panhard, René
- panharmonicon ... Panoplia Dogmatike
- Panoplia dogmatikē tēs orthodoxou pisteōs ... pantograph
- Pantokrator Mountain ... Papal States
- papalagi ... Papilio marcellus
- Papilio oregonius ... para-cresol
- para-hydrogen ... Paradoxides
- Paradoxides harlani ... parallel circuit
- parallel computer ... Parañaque
- paranasal air sinus ... parasuchian
- Parasurama ... Parent, Bernie
- Parent, Claude ... Paris 2024 Olympic Games
- Paris After Dark ... Paris, University of
- paris-mutuels ... Parker, Quanah
- Parker, Randolph Severn, III ... Parmanand Mewaram
- Parmar, Y. S. ... Parr, Thomas
- Parr, William ... Parsons, Richard
- Parsons, Richard Dean ... partial abruptio placentae
- partial acid hydrolysis ... Partido Nacionalista
- Partido Nacionalista Vasco ... Partridge, Eric Honeywood
- partridgeberry ... Pascha, Het
- Paschal candle ... passage rite
- Passage to India, A ... Passion Triptych
- passion vine ... Pastor Russell
- Pastor, Antonio ... patch box
- patch dynamics ... Path to Rome, The
- Path to the Nest of Spiders, The ... Paton, Alan Stewart
- Patos ... patrology
- patron saint ... Paul and Virginia
- Paul Brown Stadium ... Paulson, Hank
- Paulson, Henry ... Pawla
- Pawlenty, Tim ... Paysan parvenu, Le
- Paysandú ... PDK
- PdL ... peacetime rules of engagement
- peach ... Pearl Harbor attack
- Pearl Islands ... Peć
- Pecalongan ... Pedder, Lake
- Peddlers’ War ... Pedrocchi Café
- Pedrolino ... Péguy, Charles
- Peh Chiang ... Pelagius
- Pelagius I ... Pellegrini, Carlos
- Pellegrini, Il ... Pembroke, William Marshal, 1st earl of
- Pembrokeshire ... pendentive
- Pender, Paul ... penis case
- penis cover ... Pennsylvania Turnpike Commission
- Pennsylvania v. Muniz ... Pentapolis
- Pentapora ... People of the Whale
- People of Truth ... People’s University of China
- People’s Victory Canal ... peptic cell
- peptic ulcer ... Percier, Charles
- perciform ... Pereira Teixeira de Vasconcelos, Joaquim
- Pereira, Aristides ... perfect pitch
- Perfect Prince, the ... Peridiscaceae
- peridot ... peripheral nerve centre
- peripheral nervous system ... Permanent Council
- Permanent Council ... peroxy radical
- peroxyacetic acid ... Perryville Battlefield State Shrine
- Perryville, Battle of ... person-centred psychotherapy
- person-rem ... Perthshire
- Pertinax, Publius Helvius ... Pesin, Yakov
- Pesne, Antoine ... Peter I
- Peter I ... Peters, Carl
- Peters, Curtis Arnoux ... PETN
- Peto Sjarif ... petroleum refinery
- petroleum refining ... Pettit, Katherine
- Pettit, Katherine Rhoda ... Pfänder, Alexander
- Pfann, William Gardner ... phagosome
- phagostimulant ... phantom midge
- Phantom of the Opera, The ... Phasianellidae
- phasianid ... Phenomenology of Mind, The
- Phenomenology of Perception ... Philander
- Philander andersoni ... Philip of Swabia
- Philip of Valois ... Philips
- Philips & Company ... Philoponus, Joannes
- Philoponus, John ... Phiphitthaphan Haeng Chat
- Phipps Conservatory and Botanical Gardens ... Phoebe Island
- Phoebetria ... Phoneutria nigriventer
- Phong shading ... phosphorus(V) oxide
- phosphorus-32 ... photoisomerization
- photojournalism ... Phrachunlachomklao
- Phrae ... Phyllachorales
- Phyllanthaceae ... physical homogeneity
- physical layer ... Phytosauria
- Phytosaurus ... Piatt, Sarah Morgan Bryan
- Piauí ... pick six
- Pick, Arnold ... Pictorialism
- Pictou ... piedmont
- Piedmont Aviation, Inc. ... Pierre, Fort
- Pierre, Jean-Baptiste-Marie ... pigeon wheat
- pigeon’s milk ... Pilbeam, David
- pilchard ... pillow lace
- pillow lava ... pin-pallet watch
- Pin-yin romanization ... Pine tar incident
- Pine Tree Hill ... pink family
- Pink Flamingos ... Pinudjem I
- Pinus ... pipe wrench
- Pipe, Sacred ... pirarucu
- Pirata ... Pisatis
- Pisauridae ... Pit, The
- pit-pit grass ... Pitt’s Act
- Pitt’s India Act ... pivot area
- pivot bridge ... placentas
- placentation ... plainsong
- Plainsong ... planetary scale
- planetary wind system ... plantain
- plantain ... plasterboard
- plastic ... plateau, oceanic
- platelet ... Platymeris rhadamanthus
- Platyn, John ... Plea for Liberty
- pleached alley ... Plenty, Bay of
- plenty, horn of ... plica circularis
- plica sublingualis ... Plowright, Dame Joan Anne
- Plowright, Joan ... Pluriverse: New and Selected Poems
- Plus ... pneumatic action
- pneumatic caisson ... pochard
- Pochen ... Podostemum ceratophyllum
- podotheca ... Poems of the East and West
- Poems of the Past and the Present ... Pogo
- Pogo ... Point Pleasant, Battle of
- Point Reyes National Seashore ... Poitou, gate of
- Poitou-Charentes ... Polar Medal
- polar motion ... Polenlieder
- Polenov, Vasily ... Polish Partitions
- Polish Peasant in Europe and America, The ... Politicorum sive civilis doctrinae libri sex
- Politics ... polliwog
- Pollock ... Polyalthia longifolia pendula
- polyamide ... polyfidelity
- Polyflon ... polyneuropathy
- polynia ... polytheism
- polythene ... Pomorskie
- Pomorskie Lakeland ... pongo
- Pongo abelii ... Pontificia Universidad Católica del Perú
- Pontificia Universitas Gregoriana ... Poor Man and the Lady, The
- Poor Man’s Tapestry ... Pöppelmann, Matthäus Daniel
- Poppelsdorf Palace ... Populus trichocarpa
- poputchik ... porphyry
- porphyry copper deposit ... Port of New York Authority
- Port of Seven Seas ... porteño
- portent ... Porto dos Casais
- Porto dos Cazaes ... Portugal Masters
- Portugal, flag of ... positive law
- positive modulation ... Post-Modernism
- post-modernism ... postmortem muscle
- postnatal care ... potassium nitrate
- potassium nitrite ... Potorous tridactylus
- Potos flavus ... pound sterling
- Pound, Ezra ... Powell, Jerome H.
- Powell, Jody ... Powers and Prospects
- Powers of Ten ... PR
- Pr ... Pragmatic Sanction of King Ferdinand VII
- pragmatics ... prāṇa
- pranali ... Praxiteles
- Pray, Malvina ... Precious
- Precious Bane ... prefect
- prefect ... premature ejaculation
- premature seeding ... presbyopia
- presbyter ... President’s Commission on the Status of Women
- President’s Cup ... pressed glass
- Presser v. Illinois ... Pretorio, Palazzo
- Pretorius, Andries ... price discrimination
- price index ... Pridoli Series
- Pridolian Series ... primary fission trigger
- primary forest ... primer nueva corónica y buen gobierno, El
- primer pheromone ... Prince George
- Prince George Winyah Episcopal Church ... principal
- principal ... printed circuit
- printed felt base ... Prisoner of Zenda, The
- Prisoner on the Hell Planet ... privilege
- Privilege of Nieszawa ... problem
- Problem Athletes and How to Handle Them ... Próchno
- Procida, Island of ... product differentiation
- product diversification ... profitability control
- Profítis Ilías, Mount ... Progressive Party
- Progressive Party ... prolactin
- prolactinoma ... Promoters Revolution
- promotion ... proper party
- Proper Sphere of Government, The ... Propp, Vladimir
- propranolol ... Prospero
- Prospero ... protein cofactor
- protein concentrate ... Proto-Melanesian language
- Proto-Mongol ... protoplasm
- protoplasmic astrocyte ... Providence Fountain
- Providence Industrial Mission ... Prudden, Bonnie
- Prude, La ... Pryor, Richard Franklin Lennox Thomas, III
- Pryp’yat ... Psellus, Michael Constantine
- Psephenidae ... Pseudophyllidea
- Pseudopimelodidae ... Pskov school
- Pskov, Thief of ... psychological construct
- psychological continuity ... Pteranodon
- Pteraspis ... Ptilonorhynchus violaceus
- ptiloris ... public debt
- public defender ... publican
- publicani ... Puente-Genil
- Pueraria montana ... Puglia
- Puglia, Plain of ... pulmonary arch
- pulmonary arterial hypertension ... pumice cone
- pumice flow ... Punnett, Reginald Crundall
- punning arms ... Pure Heroine
- pure holding company ... purple honeycreeper
- Purple Island, The ... PUSH, Operation
- push-button dialing ... putting-out system
- Puttkamer, Johanna von ... Pye, Lucian
- pyelogram ... Pylstaert
- Pym, Barbara Mary Crampton ... pyroclastic breccia
- pyroclastic cone ... pythiosis
- Pythium ... PZT