hydroscope

noun
hy·​dro·​scope

Definition of hydroscope

: 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

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Other Words from hydroscope

hydroscopic \ ¦⸗⸗¦skäpik \ or less commonly hydroscopical \ -​pə̇kəl \ adjective

History and Etymology for hydroscope

International Scientific Vocabulary hydr- + -scope; probably originally formed as Italian idroscopio

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