| trace | (noun) a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image | Synonyms: tracing |
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| (noun) either of two lines that connect a horse's harness to a wagon or other vehicle or to a whiffletree | - |
| (noun) an indication that something has been present | Synonyms: shadow, tincture, vestige |
| (noun) a suggestion of some quality | Synonyms: ghost, touch |
| (noun) a visible mark (as a footprint) left by the passage of person or animal or vehicle | - |
| (noun) a just detectable amount | Synonyms: hint, suggestion, tint |
| tracer | (noun) ammunition whose flight can be observed by a trail of smoke | Synonyms: tracer bullet |
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| (noun) (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes | - |
| (noun) an instrument used to make tracings | - |
| (noun) an investigator who is employed to find missing persons or missing goods | - |
| tracery | (noun) decoration consisting of an open pattern of interlacing ribs | - |
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| trachea | (noun) membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi | Synonyms: windpipe |
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| (noun) one of the tubules forming the respiratory system of most insects and many arachnids | - |
| tracheid | (noun) long tubular cell peculiar to xylem | - |
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| tracheitis | (noun) inflammation of the trachea | - |
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| tracheobronchitis | (noun) common respiratory infection characterized by inflammation of the trachea and the bronchi | - |
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| tracheophyte | (noun) green plant having a vascular system: ferns, gymnosperms, angiosperms | Synonyms: vascular plant |
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| tracheostomy | (noun) a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes | Synonyms: tracheotomy |
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| tracheotomy | (noun) a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes | Synonyms: tracheostomy |
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| trachodon | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodont |
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| trachodont | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodon |
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| trachoma | (noun) a chronic contagious disease caused by a bacterium and marked by inflammation of the conjunctiva and cornea of the eye and the formation of scar tissue | - |
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| tracing | (noun) the act of drawing a plan or diagram or outline | - |
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| (noun) the discovery and description of the course of development of something | - |
| (noun) a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image | Synonyms: trace |
| track | (noun) the act of participating in an athletic competition involving running on a track | Synonyms: running |
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| (noun) any road or path affording passage especially a rough one | Synonyms: cart track, cartroad |
| (noun) a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll | Synonyms: rail, rails, runway |
| (noun) a pair of parallel rails providing a runway for wheels | - |
| (noun) a groove on a phonograph recording | - |
| (noun) (computer science) one of the circular magnetic paths on a magnetic disk that serve as a guide for writing and reading data | Synonyms: data track |
| (noun) a course over which races are run | Synonyms: racecourse, racetrack, raceway |
| (noun) an endless metal belt on which tracked vehicles move over the ground | Synonyms: caterpillar track, caterpillar tread |
| (noun) evidence pointing to a possible solution | Synonyms: lead, trail |
| (noun) a distinct selection of music from a recording or a compact disc | Synonyms: cut |
| (noun) a line or route along which something travels or moves | Synonyms: course, path |
| trackball | (noun) an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen | - |
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| tracker | (noun) someone who tracks down game | - |
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| tracking | (noun) the pursuit (of a person or animal) by following tracks or marks they left behind | Synonyms: trailing |
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| tracklayer | (noun) a workman who lays and repairs railroad tracks | Synonyms: platelayer |
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| tract | (noun) a bundle of myelinated nerve fibers following a path through the brain | Synonyms: nerve pathway, nerve tract, pathway |
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| (noun) a system of body parts that together serve some particular purpose | - |
| (noun) a brief treatise on a subject of interest; published in the form of a booklet | Synonyms: pamphlet |
| (noun) an extended area of land | Synonyms: parcel, parcel of land, piece of ground, piece of land |
| tractability | (noun) the trait of being easily persuaded | Synonyms: flexibility, tractableness |
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| tractableness | (noun) the trait of being easily persuaded | Synonyms: flexibility, tractability |
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| traction | (noun) (orthopedics) the act of pulling on a bone or limb (as in a fracture) to relieve pressure or align parts in a special way during healing | - |
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| (noun) the friction between a body and the surface on which it moves (as between an automobile tire and the road) | Synonyms: adhesive friction, grip |
| tractor | (noun) a wheeled vehicle with large wheels; used in farming and other applications | - |
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| (noun) a truck that has a cab but no body; used for pulling large trailers or vans | - |