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ergo-1

  1. a combining form meaning “work”: ergograph.
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Also especially before a vowel, erg-.

Origin of ergo-1

combining form representing Greek érgon

ergo-2

  1. a combining form of ergot: ergotoxine.
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Origin of ergo-2

From French
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
ergo- in Medicine

ergo-

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