late 14c., idroforbia, a symptom of rabies in man (sometimes used for the disease itself), from Late Latin hydrophobia (Celsius, 50 C.E.), from Greek hydrophobos "dreading water," from hydr-, stem of hydros "water" (see water (n.1)) + phobos "dread, fear" (see phobia). So called because human sufferers show aversion to water and have difficulty swallowing it.
hydrophobia hy·dro·pho·bi·a (hī'drə-fō'bē-ə)
n.
An abnormal fear of water.
Rabies.