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Tree structure
A tree structure is a hierarchical data organization in which every element except the root has exactly one parent, used in file systems and search indexes.
Tree tensor network
A tree tensor network (TTN) is a tensor network whose tensors form a tree, connecting distant sites through few intermediate tensors and used in quantum simulation and machine learning.
Tree That Owns Itself
The Tree That Owns Itself, also called the Jackson Oak, is a white oak in Athens, Georgia, said by legend to own itself and eight feet of surrounding land; the deed is unverified, and the current tree is a 1946 acorn successor.
Tree traversal
Tree traversal, also called tree walk, is the act of visiting every node of a tree data structure exactly once in a defined order so the data can be processed.
Tree well
A tree well, also called a spruce trap, is a hidden void of loose snow around a conifer's base that can trap and suffocate skiers and snowboarders.
Tree-kangaroo
Tree-kangaroo (Dendrolagus): arboreal macropodid marsupials of New Guinea and far north Queensland rainforests; about 14 species, Australia's largest tree-dwelling mammals, quadrupedal climbers, many threatened by hunting and deforestation.
tree-sitter
Tree-sitter is a parser generator tool and incremental parsing library, created by Max Brunsfeld at GitHub, that builds concrete syntax trees and updates them as files are edited.
TreeHouse Foods
TreeHouse Foods, Inc. is a North American manufacturer of private brand snacks and beverages, founded in 2005 by Dean Foods and taken private in 2026.
Treehouse of Horror
Treehouse of Horror, also known as The Simpsons Halloween Specials, is an annual series of Halloween-themed anthology episodes of The Simpsons, first aired in 1990.
Treehouse of Horror Presents: Simpsons Wicked This Way Comes
Treehouse of Horror Presents: Simpsons Wicked This Way Comes is a 2024 Simpsons episode (S36E7, 775th overall), a Ray Bradbury tribute with three segments based on The Screaming Woman, Marionettes Inc., and Fahrenheit 451, guest starring Andy Serkis.
Treehouse of Horror V
Treehouse of Horror V is The Simpsons' fifth Halloween special (season 6, episode 6, code 2F03, aired October 30, 1994), with three segments: The Shinning, Time and Punishment, and Nightmare Cafeteria.
Treehouse of Horror VI
Treehouse of Horror VI is The Simpsons' sixth Halloween special (Season 7, 1995), with segments Attack of the 50-Foot Eyesores, Nightmare on Evergreen Terrace, and the pioneering 3D computer-animated Homer³ by Pacific Data Images.
Treehouse of Horror XXV
Treehouse of Horror XXV is the 25th annual Simpsons Halloween special (S26E4, 556th overall), aired October 19, 2014 on Fox. Written by Stephanie Gillis, directed by Matthew Faughnan, its segments are School Is Hell, A Clockwork Yellow, and The Others.
Treehouse of Horror XXXIV
Treehouse of Horror XXXIV is The Simpsons' 34th Halloween special, aired November 5, 2023 (S35E05, Fox). Its segments are Wild Barts Can't Be Token (NFT satire), Ei8ht (Se7en parody in which Lisa kills Sideshow Bob), and Lout Break (pandemic parody).
Treehouse of Horror XXXV
Treehouse of Horror XXXV, The Simpsons season 36 episode 5 (773rd overall), aired November 3, 2024 on Fox. Three non-canon Halloween segments parodying Pacific Rim, Poe's Fall of the House of Usher, and Venom, with a Jorge R. Gutierrez Street Fighter-style opening and stop-motion jeans by Stoopid Buddy Stoodios.
Treehouse of Horror XXXVI
Treehouse of Horror XXXVI is the 36th Simpsons Halloween special, aired October 19, 2025 (S37E3, episode 793), with segments parodying Jaws, Late Night with the Devil, and Waterworld, guest-starring Idris Elba and Michael Keaton.
Treehouse TV
Treehouse TV is a Canadian preschool specialty channel licensed by the CRTC in 1996 and launched in 1997 from a YTV block, owned by YTV Canada under Corus Entertainment, airing commercial-free programming for children up to age six.
Treeing Walker Coonhound
Treeing Walker Coonhound, or Treeing Walker, an American scent hound from Tennessee Lead and Walker Foxhound lines; AKC-recognized 2012; tri-colored, 22–27 inch hunter that trees raccoons and larger game.
Trees of India
Trees of India: the country's tree species and tree cover, 827,357 sq km (25.17% of land) per ISFR 2023, in 16 forest type groups from Western Ghats evergreen to Himalayan pine and thorn forests.
Treeshrew
A treeshrew is a small mammal of the order Scandentia, native to south-central and Southeast Asia, feeding mainly on insects and, despite the name, neither a shrew nor committed to trees.
Treewidth
Treewidth is a graph parameter that measures how far a graph is from being a tree, defined as the minimum width of any tree decomposition of the graph.
Trefoil knot
The trefoil knot, or cloverleaf knot, is the simplest nontrivial knot in mathematics, obtained by joining the ends of an overhand knot; it is listed as 3₁.
Treg Taylor
Treg Taylor is an American Republican politician who served as Alaska attorney general from 2021 to 2025 and is the Republican nominee for governor of Alaska in 2026.
Tregenza Roach
Tregenza Roach is an American Democratic politician and attorney serving as Lieutenant Governor of the U.S. Virgin Islands under Governor Albert Bryan Jr., having previously served three terms as a senator.
TREGZI
TREGZI (Orca-T), allogeneic regulatory T cell immunotherapy with HSPC and T cells-vldq, is Orca Bio's FDA-approved (June 30, 2026) cell therapy for matched donor stem cell transplant in adults with hematological malignancies, improving cGVHD-free survival.
Trehalase
Trehalase (EC 3.2.1.28, alpha,alpha-trehalase) is a disaccharidase hydrolyzing trehalose into two glucose molecules; found in fungi, foods, and the human intestinal brush border, with FDA GRAS notices GRN 699 and GRN 727 for industrial enzyme preparations.
Trehalase deficiency
Trehalase deficiency (isolated trehalose intolerance, TREH gene, 11q23.3, rs2276064) is a rare autosomal dominant intestinal disorder causing osmotic diarrhea after eating mushrooms; found in about 8% of Greenlanders but rare elsewhere.
Trehalose
Trehalose, also known as mushroom sugar or mycose, is a non-reducing sugar of two glucose units found across archaea, bacteria, fungi, plants, and insects, discovered in 1832.
Trehalose synthase
Trehalose synthase (TreS, EC 5.4.99.16) is a bacterial enzyme that reversibly converts maltose to trehalose in one step; studied for industrial trehalose production, immobilization, and protein engineering.
Trei Phum
Trei Phum, also romanised Trai Bhumi or Trai Phum, is the Khmer-language treatise on Buddhist cosmology describing the three planes of rebirth, reworked under King Ang Duong.