a combining form meaning “speed,” used in the formation of compound words: tachometer.
Origin of tacho-
combining form representing Greek táchos; akin to tachýs swift
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for tacho-
Word Origin for tacho-
from Greek takhos
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012