hydroscope

[hahy-druh-skohp]
noun
an optical device for viewing objects below the surface of water.

Origin:
1670–80; hydro-1 + -scope

hydroscopic [hahy-druh-skop-ik] , hydroscopical, adjective
hydroscopicity [hahy-druh-skoh-pis-i-tee] , noun
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World English Dictionary
hydroscope (ˈhaɪdrəˌskəʊp)
 
n
any instrument for making observations of underwater objects
 
hydroscopic
 
adj
 
hydro'scopical
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Yet, there apparently is no such word as hydroscopic.
It is non-volatile, non-hydroscopic, but only slightly soluble in water.
All core binders shall be non-hydroscopic and non-wicking dielectric material or be rendered such by the filling compound.
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