| tonograph | (noun) A recording tonometer, used in medicine. | - |
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| topography | (noun) the configuration of a surface and the relations among its man-made and natural features | - |
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| (noun) precise detailed study of the surface features of a region | - |
| triskaidekaphobia | (noun) a morbid fear of the number 13 | - |
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| typographer | (noun) one who sets written material into type | Synonyms: compositor, setter, typesetter |
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| typography | (noun) the craft of composing type and printing from it | - |
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| (noun) art and technique of printing with movable type | Synonyms: composition |
| ultrasonography | (noun) using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs | Synonyms: echography, sonography, ultrasound |
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| venography | (noun) roentgenographic examination of veins | - |
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| vibraphone | (noun) a percussion instrument similar to a xylophone but having metal bars and rotating disks in the resonators that produce a vibrato sound | Synonyms: vibes, vibraharp |
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| vibraphonist | (noun) a musician who plays the vibraphone | Synonyms: vibist |
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| viewgraph | (noun) a transparency for use with an overhead projector | Synonyms: overhead |
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| xerography | (noun) forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas | - |
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| xeroradiography | (noun) radiography using X-rays and xerographic (rather than roentgenographic) techniques | - |
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