In the occult philosophy of Paracelsus, a being having water as its element.
A female water spirit who can acquire a soul by marrying, and having a child by, a mortal.
(rare outside fiction) A female given name.
Origin of undine
From German Undine (“undine"), first used as a given name in the novel Undine by Friedrich de la Motte FouquÃ© and in 19th century operas based on the book.