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Theory of three styles
The theory of three styles (теория трёх стилей) is the doctrine dividing a literary language into high, middle, and low registers, most influentially stated by Lomonosov in 1758.
Theory of tides
The theory of tides explains the sea's periodic rise and fall through the gravitational pull of the Moon and Sun, beginning with Newton in 1687.
Theory X and Theory Y
Theory X and Theory Y are two contrasting sets of assumptions managers hold about employee motivation, described by Douglas McGregor in 1957 and in his 1960 book The Human Side of Enterprise.
Theory-ladenness
Theory-ladenness is the philosophy of science thesis that observation and evidence are shaped by the investigator's theoretical presuppositions, leaving no purely theory-neutral basis for testing theories; it is associated with Hanson and Kuhn.
Theos (think tank)
Theos (think tank), UK religion and society think tank founded November 2006, part of the British and Foreign Bible Society; London-based Christian inter-confessional research body known for reports on faith, politics, and social cohesion.
Theosophical Society
The Theosophical Society is an international organization founded in New York in 1875 by Helena Blavatsky, Henry Olcott, and William Judge, dedicated to universal brotherhood and comparative study of religion.
Theosophy
Theosophy, or the Theosophical Movement, is a religious and philosophical current founded in New York in 1875 by Helena Blavatsky, Henry Steel Olcott, and William Quan Judge.
Theosophy and visual arts
Theosophy and visual arts: influence of the 1875 Blavatsky-Olcott esoteric movement on modern painting, shaping Symbolism and abstraction through Kandinsky, Mondrian, Hilma af Klint, Kupka, Thought-Forms color symbolism, and Ringbom's scholarship.
Theotokos (Θεοτόκος)
Theotokos (Θεοτόκος) is a Greek title of the Virgin Mary meaning "the one who gave birth to God", affirmed at Ephesus in 431 against Nestorius, who preferred Christotokos.
Theotokos Kosmosoteira
Theotokos Kosmosoteira (Παναγία Κοσμοσώτειρα) is a 1151/2 Byzantine monastery church in Feres, Thrace, founded by Sebastokrator Isaac Komnenos; its katholikon, Komnenian frescoes, eagle emblem, and Typikon survive.
Theotokos of the Sign
The Theotokos of the Sign, or Znamenie, is an Eastern Orthodox icon type showing the Virgin with hands raised and the Christ child in a medallion on her chest.
TheoTown
TheoTown is a city-building simulation by Lobby/blueflower, first on Android in 2017, Steam 2019. Zoning, transit, disasters, and a JSON/Lua plugin ecosystem distinguish it; free with ads on mobile, premium on Steam.
Theoxena of Egypt
Theoxena (Greek Θέοξενα) was a Syracusan royal woman of the early 3rd century BC, daughter of King Agathocles of Syracuse, banished by Ptolemy II to the Thebaid.
Theoxena of Syracuse
Theoxena of Syracuse (Greek Θεοξένα) was a Macedonian noblewoman, probably a daughter of Berenice I and stepdaughter of Ptolemy I, who married Agathocles, ruler of Syracuse, around 300 BC.
Thera (Greece)
Thera (Θήρα), ancient name of Santorini and its Dorian city on Mesa Vouno, founded 8th century BC by colonists led by Theras, formerly Kallisti; colony Cyrene 631 BC, Ptolemaic 288–145 BC, inhabited to 9th century AD.
Thera Macula
Thera Macula, a dark chaos terrain on Jupiter's moon Europa, southern trailing hemisphere, 95 km across; a low-lying collapsed dome possibly over a subsurface water lens, targeted by Europa Clipper flybys.
Therac-25
The Therac-25 was a computer-controlled radiation therapy machine built by Atomic Energy of Canada Limited, involved in six radiation overdose accidents with three deaths from 1985 to 1987.
Theracos
Theracos, now TheracosBio, is a privately held pharmaceutical company in Marlborough, Massachusetts. It developed Brenzavvy (bexagliflozin), an oral SGLT2 inhibitor for type 2 diabetes approved by the FDA in 2023.
Theranda
Theranda (Thermidava), a Roman road station on the Lissus-Naissus road in Upper Moesia, Kosovo; recorded on the Tabula Peutingeriana between Gabuleo and Viciano, located near Suva Reka or Ljubižda, not Prizren.
Theranos
Theranos, founded by Elizabeth Holmes in 2003, was a blood-testing startup claiming Edison-device finger-prick diagnostics; it raised over $700 million, was valued at $9 billion, collapsed after 2015 WSJ exposure, and led to fraud convictions and $452 million restitution.
Theranostic Nanomedicine
Theranostic nanomedicine, or nanotheranostics, integrates diagnostic imaging and targeted therapy in a single nanoparticle platform. Key examples include NBTXR3 hafnium oxide radioenhancers, NanoTherm iron oxide glioma therapy, and ferumoxytol MRI agents; translation is limited by heterogeneity, manufacturing, and regulation.
Theranostics
Theranostics, a term coined in 1998 fusing therapy and diagnostics, is the nuclear medicine practice of imaging a tumor target and treating it with a matched radiopharmaceutical.
Therapeutic abortion
Therapeutic abortion is the intentional termination of a pregnancy that endangers the woman's health or life, or in which the fetus has a condition incompatible with normal life.
Therapeutic angiogenesis
Therapeutic angiogenesis is a regenerative-medicine treatment that stimulates new blood vessel growth in ischemic tissue, mainly for critical limb ischemia and refractory angina when bypass or angioplasty is not possible.
Therapeutic apheresis
Therapeutic apheresis is a medical procedure that removes specific blood components, such as plasma, cells, or lipids, from a patient's circulation to treat disease. Its defining procedure is therapeutic plasma exchange.
Therapeutic delivery
Therapeutic Delivery is a MEDLINE-indexed peer-reviewed academic journal covering drug delivery, founded by Future Science in 2010 and published by Taylor & Francis since 2024, printing original research and reviews.
Therapeutic drug monitoring
Therapeutic drug monitoring (TDM) is the measurement of drug concentrations in blood, with pharmacological interpretation, to individualize and adjust dosing for drugs with narrow therapeutic windows.
Therapeutic horseback riding
Therapeutic horseback riding (THR) is an equine-assisted service in which individuals ride horses under trained supervision to improve physical, psychological, and social functioning, recognizable since the mid-twentieth century.
Therapeutic index
Drug therapeutic index (TI, therapeutic ratio): ratio of toxic dose (TD50 or LD50) to effective dose (ED50); values above 10 indicate a wide safety margin, while narrow-TI drugs like warfarin and digoxin require therapeutic drug monitoring.
Therapeutic Irrigation
Therapeutic irrigation, also called lavage, is the washing of a body cavity or wound with flowing fluid for therapy or diagnosis, used across nearly every branch of medicine.