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tachy-

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  1. a combining form meaning “swift,” used in the formation of compound words: tachygraphy.
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Origin of tachy-

< Greek, combining form of tachýs
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tachy-

tachy-

tacheo-

combining form
  1. swift or acceleratedtachycardia; tachygraphy; tachylyte; tachyon; tachyphylaxis
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Word Origin

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

Word Origin and History for tachy-

word-forming element meaning "rapid, swift, fast," from Latinized comb. form of Greek takhy "swift."

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Online Etymology Dictionary, © 2010 Douglas Harper

tachy- in Medicine

tachy-

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