noun
extreme or irrational fear of water; rabies (an infectious viral disease of the nervous system of warm-blooded animals, including humans, that is transmitted by the bite of an infected animal and is characterized by symptoms such as hydrophobia, headache, and fever.)
Hydro means water. Phobia means fear. A person with hydrophobia has an extreme fear of water, often to the point of physical distress, like a dog with rabies whose throat constricts at the sight of water.