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Dictionary

ta•chom•e•ter

Pronunciation: (ta-kom'i-tur, tu-), [key]
—n.
1. any of various instruments for measuring or indicating velocity or speed, as of a machine, a river, or the blood.
2. an instrument measuring revolutions per minute, as of an engine.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

tachograph

tachy-

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