| tach | (noun) measuring instrument for indicating speed of rotation | Synonyms: tachometer |
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| tacheometer | (noun) a theodolite designed for rapid measurements | Synonyms: tachymeter |
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| tachistoscope | (noun) scientific instrument used by psychologists; presents visual stimuli for brief exposures | Synonyms: t-scope |
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| tachogram | (noun) a graphical record of speed and distance produced by a tachograph | - |
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| tachograph | (noun) a tachometer that produces a graphical record of its readings; used to record the speed and duration of trips in a motor vehicle | - |
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| tachometer | (noun) measuring instrument for indicating speed of rotation | Synonyms: tach |
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| tachycardia | (noun) abnormally rapid heartbeat (over 100 beats per minute) | - |
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| tachygraphy | (noun) a method of writing rapidly using an abbreviated symbolic system | Synonyms: shorthand, stenography |
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| tachylite | (noun) a basic or basalt glass | - |
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| tachymeter | (noun) a theodolite designed for rapid measurements | Synonyms: tacheometer |
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