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- tree
- tree fern
- tree frog
- tree of heaven
- trench warfare
- trent affair
- trent canal
- trent, council of
- trentino–alto adige
- trenton and princeton, battles of
- trespass
- triad
- triage
- trial
- triangle
- triangle shirtwaist co. fire
- trianon, treaty of
- triassic period
- triathlon
- tribe
- tribology
- tribune
- tricarboxylic acid cycle
- triceratops
- trichina
- trichinosis
- trichomonad
- trickster tale
- trident missile
- trieste
- triggerfish
- triglyceride
- trigonometric function
- trigonometry
- trikaya
- trillium
- trilobite
- trimurti
- trinidad and tobago
- trinity college
- trinity, holy
- trio sonata
- tripitaka
- triple alliance
- triple alliance, war of the
- triple crown
- triple entente
- triple jump
- tripoli
- tripolitan war
- tripolitania
- tripura
- trireme
- tristan and isolde
- triticale
- tritium
- triton
- triumph
- triumphal arch
- triumvirate
- troas
- trobriand islands
- trobriander
- troilus and cressida
- trojan asteroids
- trojan war
- trombone
- trompe l'oeil
- tropic of cancer
- tropic of capricorn
- tropical cyclone
- tropical fish
- tropical medicine
- troposphere
- troppau, congress of
- trotskyism
- troubadour
- troubles, time of
- trout
- trouvère
- trowbridge
- troy
- trubetskoy family
- truce of god
- truck
- truffle
- trullo
- truman doctrine
- trumpet
- trumpeter swan
- truss
- trust
- trust company
- trust fund
- truth
- trw inc.
- tryptophan
- tsar
- tsetse fly
- tsimshian