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 23 May. 2022.
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