Definition of "tachymeter" []

• A surveying instrument used for the rapid determination of distances, elevations, and bearings. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Its tachymeter function used to convert time intervals to speed or rates of events is etched around the rim of the analog face."
• "Ok, so there is a difference between tachometer and tachymeter."
• "Hodinkee: "In 1972, Heuer launched a promotion with the Viceroy brand of cigarettes to sell a distinctive self-winding caliber 12 Autavia with a black dial, red hands, and a tachymeter bezel (like on the Siffert Autavias) for $88 to those that sent in one carton end flap.""