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a combining form meaning “swift,” used in the formation of compound words:
Compare tacho-.
Origin of tachy-
< Greek, combining form of tachýs Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for tachy-


combining form
swift or accelerated: tachycardia, tachygraphy, tachylyte, tachyon, tachyphylaxis
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
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Word Origin and History for tachy-

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

Online Etymology Dictionary, © 2010 Douglas Harper
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tachy- in Medicine

tachy- pref.
Rapid; accelerated: tachycardia.

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