[ster-ee-oh, steer-]
noun, plural stereos.
stereoscopic photography.
a stereoscopic photograph.
stereophonic sound reproduction.
a system or the equipment for reproducing stereophonic sound.
Printing. stereotype ( defs 1, 2 ).
pertaining to stereophonic sound, stereoscopic photography, etc.
verb (used with object)
Printing. stereotype ( def 5 ).

1815–25; by shortening Unabridged


a combining form borrowed from Greek, where it meant “solid”, used with reference to hardness, solidity, three-dimensionality in the formation of compound words: stereochemistry; stereogram; stereoscope.
Also, especially before a vowel, stere-.

< Greek stereós

stereo. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stereo (ˈstɛrɪəʊ, ˈstɪər-)
1.  stereophonic short for stereoscopic
n , stereos
2.  stereophonic sound: to broadcast in stereo
3.  a stereophonic record player, tape recorder, etc
4.  photog
 a.  stereoscopic photography
 b.  a stereoscopic photograph
5.  printing short for stereotype
[C20: shortened form]

stereo- or (sometimes before a vowel) stere-
combining form
indicating three-dimensional quality or solidity: stereoscope
[from Greek stereos solid]
stere- or (sometimes before a vowel) stere-
combining form
[from Greek stereos solid]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1823 as a shortening of stereotype; 1876 from stereoscope (1838); 1954 (adj.) as a shortening of stereophonic (1927); the noun meaning "stereophonic record or tape player" is recorded from 1964.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

stereo- pref.

  1. Solid; solid body: stereotropism.

  2. Three-dimensional: stereochemistry.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


equipment for sound recording and reproduction that utilizes two or more independent channels of information. Separate microphones are used in recording and separate speakers in reproduction; they are arranged to produce a sense of recording-hall acoustics and of the location of instruments within an orchestra. The effectiveness of stereophonic reproduction was demonstrated as early as 1933. Two-track stereophonic tape for the home became common in the 1950s and the stereophonic phonograph record, with two separate channels of information recorded in a single groove, in 1958. In the early 1970s, quadraphonic sound systems, employing four independent channels of information for even greater realism, became commercially available and later led to "surround-sound" systems

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
In the living room, they created a built-in display case to showcase art and
  conceal stereo equipment.
Another test asked participants to work out the direction of specific sounds
  embedded within stereo white noise.
CD s are still recorded in stereo using only two channels.
Your old ability to see in stereo vision has deserted you.
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