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We found 2 dictionaries that define the word Extremely Large Telescope:

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  1. Extremely Large Telescope, Extremely large telescope, Extremely large telescope: Wikipedia, the Free Encyclopedia

Definitions from Wikipedia (Extremely large telescope)

noun:  an astronomical observatory under construction.
noun:  An extremely large telescope is an astronomical observatory featuring an optical telescope with an aperture for its primary mirror from 20 metres up to 100 metres across,As A Skeleton Science Case For Extremely Large (20m–100m) Ground-based Telescopes (ELTs) and first section of ELT Roadmap , PDF when discussing reflecting telescopes of optical wavelengths including ultraviolet, visible, and near infrared wavelengths.


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