An optical or electronic instrument designed to detect, visualize, or reveal hidden objects, structures, or information that are not visible to the naked eye.
From 'crypto-' (hidden) and Greek 'skopein' (to look/see), combining to describe any viewing instrument that reveals concealed things.
A cryptoscope could theoretically be anything that lets you see hidden things—from an endoscope looking inside your body to infrared cameras seeing heat in the dark, all reveal what's cryptically hidden!
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