noun, plural electros.

by shortening

Dictionary.com Unabridged


a combining form representing electric, or electricity, in compound words: electromagnetic.
Also, especially before a vowel, electr-.

electr(ic) + -o-

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
electro (ɪˈlɛktrəʊ)
n , pl -tros
electroplate short for electrotype

electro- or (sometimes before a vowel) electr-
combining form
1.  electric or electrically: electrocardiograph; electrocute
2.  electrolytic: electroanalysis
[from New Latin, from Latin ēlectrum amber, from Greek ēlektron]
electr- or (sometimes before a vowel) electr-
combining form
[from New Latin, from Latin ēlectrum amber, from Greek ēlektron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

electro- or electr-

  1. Electricity; electric; electrically: electrocautery.

  2. electron: electronegative.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Electro-mechanically controlled molecules in the fibers could change the shape
  of a garment with the tap of a button.
Our thoughts are electro-chemical reactions to stimuli that, in turn, cause
  other thoughts and reactions.
It has concentrated its development of electro-optical imaging systems towards
  optimizing both the spatial and spectral domain.
Scientists use electro-fishing equipment for various purposes.
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