[genus] Iduna is a genus of tree warbler in the Acrocephalidae family. It is sometimes lumped together in the genus Hippolais. It contains the following species: ...
Found on
http://en.wikipedia.org/wiki/Iduna_(genus)
[literature society] Iduna was an important literary association founded in May 1891 by a circle of writers around Fritz Lemmermayer. Lemmermayer acted as a sort of `middle man` between an older generation of authors (which included Fercher von Steinwand, Joseph Tandler, Auguste Hyrtl, Ludwig von Mertens, and Josephone von Knorr) and a grou...
Found on
http://en.wikipedia.org/wiki/Iduna_(literature_society)

In Norse mythology, Iduna (or Idun) was the wife of Bragi. She kept golden apples in a box which the gods ate to keep themselves young. She was carried off by Thiassi and imprisoned in the nether world, from which she escaped in spring in the form of a bird.
Found on
http://www.probertencyclopaedia.com/browse/D4.HTM

Iduna is a cultivated variety of potato.
Found on
http://www.probertencyclopaedia.com/browse/QI.HTM
No exact match found.