from The Century Dictionary.
- noun A morbid impulse to excessive drinking of water.
- noun In pathology, a species of melancholia under the influence of which the sufferer is led to commit suicide by drowning. It sometimes appears in pellagra.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
morbid cravingfor water.
Sorry, no etymologies found.
Chatsworth,  and have discovered that the hydromania is almost as bad as the hydrophobia.