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prospective glass

noun
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Definition of prospective glass

1 obsolete : a crystal or mirror used to predict the future in Time's long and dark prospective glass, foresaw what future days should bring to pass— John Milton
2 : a small portable telescope

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“Prospective glass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prospective%20glass. Accessed 22 Jan. 2021.

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