hy·dro·scope 
(hīdrə-skōp′)
(hīdrə-skōp′)n.
An optical device used for viewing objects far below the surface of water.
hy′dro·scopic (-skŏpĭk) adj.
- hydrophanous
- hydrophile
- hydrophilic
- hydrophilicity
- hydrophilous
- hydrophily
- hydrophobia
- hydrophobic
- hydrophobicity
- hydrophone
- hydrophyte
- hydrophytic
- hydroplane
- hydroponic
- hydroponically
- hydroponicist
- hydroponics
- hydroponist
- hydropower
- hydroquinol
- hydroquinone
- hydroscope
- hydroscopic
- hydrosol
- hydrosolic