undine
noun/ˈʌndiːn/
Etymology From German Undine, from New Latin undīna, from Latin unda (“wave”).
1
A female water-sprite or nymph.
2
The elemental being of water.
3
Medicine, Sciences a small flask used to apply lotions to the eye.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.