hydroscope
noun
hy·dro·scope
: a device for enabling a person to see an object at a considerable distance below the surface of water by means of a series of mirrors enclosed in a steel tube compare water glass
hydroscopic
adjective
¦⸗⸗¦skäpik
or less commonly hydroscopical
-pə̇kəl
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Merriam-Webster unabridged
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