An optical device used for viewing objects far below the surface of water.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "hydroscope" in a sentence
"MAHMOUD EL KHZNDAN, SHIFA HOSPITAL: So much people killed simply because you have no test tube, no hydroscope, no tube, no I.V. lines, no narcotics for no crushed injuries."
"It might be said that he divined the course of seams in the depths of the coal mine as a hydroscope reveals springs in the bowels of the earth."
"Astounded, I continued to adjust the hydroscope to a range incredible, turning the screw to focus at a mile and a half, at two miles, at two and a quarter, a half, three-quarters, three miles, three miles and a quarter -- click!"