a combining form meaning “swift,” used in the formation of compound words: tachygraphy.
Compare tacho-.

Origin of tachy-

<Greek, combining form of tachýs
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for tachy-



combining form

swift or acceleratedtachycardia; tachygraphy; tachylyte; tachyon; tachyphylaxis

Word Origin for tachy-

from Greek takhus swift
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

Medical definitions for tachy-



Rapid; accelerated:tachycardia.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.