All articles starting with P
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Pratt & Whitney F135
The Pratt & Whitney F135 is an afterburning turbofan engine, developed from the F119 and selected in 2001, that powers all three variants of the Lockheed Martin F-35 Lightning II.
Pratt & Whitney J58
The Pratt & Whitney J58 (company designation JT11D-20) is an afterburning turbojet developed for continuous Mach 3 flight as the powerplant of the Lockheed SR-71 Blackbird.
Pratt & Whitney JT3D
The Pratt & Whitney JT3D is a low-bypass turbofan engine of the late 1950s that powered Boeing 707 and DC-8 airliners and, as the TF33, the B-52H.
Pratt & Whitney JT8D
The Pratt & Whitney JT8D is a low-bypass turbofan that entered service on the Boeing 727 in 1964 and powered over 4,500 aircraft, with more than 14,000 engines built.
Pratt & Whitney PW1000G
The Pratt & Whitney PW1000G, marketed as the GTF, is a geared turbofan engine family that powers the Airbus A320neo, A220, and Embraer E2, entering service in 2016.
Pratt & Whitney PW2000
The Pratt & Whitney PW2000 is a family of high-bypass turbofan engines that entered service on the Boeing 757 in 1984 as the first commercial engine with FADEC.
Pratt & Whitney PW300
The Pratt & Whitney PW300 is a family of two-spool turbofan engines built by Pratt & Whitney Canada for mid-size and heavy business jets, in service since 1991.
Pratt & Whitney PW4000
The Pratt & Whitney PW4000 is a family of high-bypass turbofan engines for large commercial aircraft, powering the Boeing 747, 767, 777, and Airbus A330.
Pratt & Whitney PW800
The Pratt & Whitney PW800 is a family of high-bypass turbofan engines built by Pratt & Whitney Canada, powering the Gulfstream G500, G600, and G400 and the Dassault Falcon 6X.
Pratt & Whitney R-1830 Twin Wasp
The Pratt & Whitney R-1830 Twin Wasp is an American 14-cylinder, two-row radial engine built from 1932 to 1951, more than any other aircraft engine, at 173,618 units.
Pratt & Whitney R-2800 Double Wasp
The Pratt & Whitney R-2800 Double Wasp is an American 18-cylinder, air-cooled radial aircraft engine produced from 1939 to 1960, powering the P-47 Thunderbolt, F4U Corsair, and F6F Hellcat.
Pratt & Whitney R-4360 Wasp Major
The Pratt & Whitney R-4360 Wasp Major is an American 28-cylinder, four-row air-cooled radial aircraft engine built from 1944 to 1955, powering the B-36, B-50, and Boeing 377 Stratocruiser.
Pratt & Whitney R-985 Wasp Junior
Pratt & Whitney R-985 Wasp Junior: nine-cylinder air-cooled supercharged radial aircraft engine, 300–450 hp, 985 cu in, first certificated January 1930; 39,037 built 1929–1953; powered Beech 18, Lockheed Electra, Grumman Goose, DHC Beaver, and WWII trainers.
Pratt & Whitney TF30
The Pratt & Whitney TF30 is an American afterburning turbofan engine that powered the F-111 and F-14A Tomcat, the first American turbofan with an afterburner.
Pratt & Whitney Wasp series
Pratt & Whitney Wasp series: family of air-cooled radial piston aircraft engines from the 1925 R-1340 Wasp through the R-1830 Twin Wasp (173,618 built) and R-4360 Wasp Major, powering DC-3, B-24, B-36.
Pratt Institute
Pratt Institute, also known as Pratt University, is a private college in Brooklyn, New York, devoted to art, design, and architecture education. Charles Pratt founded it in 1887.
Pratt truss
The Pratt truss is a bridge truss with diagonals in tension and verticals in compression, patented by Thomas and Caleb Pratt in 1844 and once the most common US bridge form.
Pratyabhijna school
The Pratyabhijna school (प्रत्यभिज्ञा, "Recognition") is a Kashmiri Shaiva philosophical school founded by Somananda and systematized by Utpaladeva, teaching that liberation is the recognition of oneself as Shiva.
Pratyabhijnahrdayam
Pratyabhijnahrdayam, the Heart of Recognition, is an 11th-century Sanskrit digest of the Pratyabhijna school of nondual Kashmiri Shaivism, written by Kshemaraja, disciple of Abhinavagupta, in twenty sutras with his own commentary.
Pratyahara (प्रत्याहार)
Pratyahara (प्रत्याहार) is the fifth of the eight limbs of yoga in Patañjali's Yoga Sūtra, defined as the withdrawal of the senses from their objects.
Pratyangira (प्रत्यङ्गिरा)
Pratyangira (प्रत्यङ्गिरा), also called Narasimhi or Atharvana Bhadrakali, is a Hindu Tantric lion-faced goddess worshipped via mantras and yantras for protection and enemy destruction, with temples mainly in Tamil Nadu.
Pratylenchus
Pratylenchus, root-lesion nematodes (Filipjev 1936, ~100 species), migratory endoparasites of plant roots in Pratylenchidae; third most important plant-parasitic nematode genus, causing crop yield losses up to 85%.
Pratylenchus penetrans
Pratylenchus penetrans, the northern root-lesion nematode (Cobb, 1917), is a migratory endoparasitic nematode of roots, cosmopolitan across 69 countries, damaging potato, tobacco, tomato, and soybean, and distinguished from P. fallax by a smooth tail tip.
Pratyush Kumar
Pratyush Kumar is an Indian artificial intelligence researcher and entrepreneur who co-founded Sarvam AI in 2023 with Vivek Raghavan, selected in 2025 to build India's first sovereign large language model.
Pratyusha Banerjee (प्रत्यूषा बनर्जी)
Pratyusha Banerjee (प्रत्यूषा बनर्जी) was an Indian TV actress famous as Anandi in Balika Vadhu, later on Bigg Boss 7 and Hum Hain Na; she died in Mumbai in April 2016, aged 24, and her boyfriend Rahul Raj Singh was discharged from the abetment case by the Bombay High Court in 2026.
Praurime Fluctus
Praurime Fluctus is a 750-km-diameter lava flow field on Venus at 16N, 154E, named in 1997 for a Lithuanian fire goddess and mapped by Magellan radar as a southern flow lobe.
Pravala bhasma
Pravala bhasma (Praval Bhasma) is an Ayurvedic calcined coral preparation, a calcium-rich animal-origin Rasashastra drug compiled in Bhaishajya Ratnavali, distinct from Pravala pishti and exempt from expiry dating under India's Drugs Rules.
Pravala Pancamrta Rasa
Pravala Pancamrta Rasa (Pravāla pañcamṛta rasa) is a Kharaliya rasayana of Ayurvedic Rasashastra: five calcined marine bhasmas (coral, pearl, conch, oyster, cowry) triturated with Calotropis latex, dosed 250 mg, used for pittaja disorders and as a calcium supplement.
Pravala Pisti
Pravala Pisti (Pravāla piṣṭī), Ayurvedic coral-calcium powder triturated with rose water, a Sudha Varga preparation; dose 250 mg, used for Pitta disorders, acidity, and as calcium supplementation, distinct from calcined Pravala Bhasma.
Pravarasena II
Pravarasena II (प्रवरसेण द्वितीय) was a Vakataka king in Vidarbha who took the throne after his mother Prabhavatigupta's regency and is credited with the Prakrit poem Setubandha.