| tun | (noun) a large cask especially one holding a volume equivalent to 2 butts or 252 gals | - |
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| tuna | (noun) any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters | Synonyms: tunny |
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| (noun) New Zealand eel | Synonyms: Anguilla sucklandii |
| (noun) important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks | Synonyms: tuna fish, tunny |
| (noun) tropical American prickly pear of Jamaica | Synonyms: Opuntia tuna |
| tunaburger | (noun) a sandwich that resembles a hamburger but made with tuna instead of beef | - |
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| tundra | (noun) a vast treeless plain in the Arctic regions where the subsoil is permanently frozen | - |
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| tune | (noun) the adjustment of a radio receiver or other circuit to a required frequency | - |
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| (noun) the property of producing accurately a note of a given pitch | - |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: air, line, melodic line, melodic phrase, melody, strain |
| tunefulness | (noun) the property of having a melody | Synonyms: melodiousness |
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| tuner | (noun) an electronic receiver that detects and demodulates and amplifies transmitted signals | Synonyms: radio, radio receiver, radio set, receiving set, wireless |
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| (noun) someone who tunes a musical instrument | - |
| tung | (noun) Chinese tree bearing seeds that yield tung oil | Synonyms: Aleurites fordii, tung-oil tree, tung tree |
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| tungstate | (noun) a salt of tungstic acid | - |
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| tungsten | (noun) a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite | Synonyms: atomic number 74, W, wolfram |
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| tunic | (noun) any of a variety of loose fitting cloaks extending to the hips or knees | - |
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| (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: adventitia, tunica |
| tunica | (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: adventitia, tunic |
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| tunicate | (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: urochord, urochordate |
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| tuning | (noun) (music) calibrating something (an instrument or electronic circuit) to a standard frequency | - |
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| tunnage | (noun) a tax imposed on ships that enter the US; based on the tonnage of the ship | Synonyms: tonnage, tonnage duty |
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| tunnel | (noun) a passageway through or under something, usually underground (especially one for trains or cars) | - |
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| (noun) a hole made by an animal, usually for shelter | Synonyms: burrow |
| tunny | (noun) any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters | Synonyms: tuna |
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| (noun) important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks | Synonyms: tuna, tuna fish |