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  • eso-
    eso-
    a combining form meaning “inner,” used in the formation of compound words.
  • ESO
    ESO
    abbreviation
    European Southern Observatory

eso-

American  
  1. a combining form meaning “inner,” used in the formation of compound words.

    esonarthex.


ESO British  

abbreviation

  1. European Southern Observatory

"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

Etymology

Origin of eso-

< Greek, combining form representing ésō within

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

"When a satellite crosses what we observe, it makes a bright streak on our image, zapping whatever is behind it," said ESO astronomer Olivier Hainaut, who led the study published in Astronomy & Astrophysics.

From Barron's Jul. 1, 2026

Europe's ESO star-gazing organisation on Monday welcomed plans to call off building a massive green energy project in the Chilean desert which threatened to spoil its telescopes' view of the darkest skies on Earth.

From Barron's Feb. 2, 2026

Twelve hours later, he submitted an observation request to ESO, which approved it soon after.

From Science Daily Nov. 16, 2025

Kay, who got into gaming thanks to her dad and has been playing ESO since the beginning, says long-term players refer to themselves as an "ESO fam".

From BBC Jun. 17, 2024

"Finding an age discrepancy between the stars suggests that this scenario is the most plausible one and it was only possible to show it with the new ESO data."

From Science Daily Apr. 11, 2024

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