Idun

UK: /ˈiːdʊn/ US: (ē′ᵺŏŏn)

WordReference Random House Unabridged Dictionary of American English © 2025

I•dun  (ē′ᵺŏŏn), n. [Scand. Myth.]

1. Mythology a goddess, keeper of the apples of youth and wife of Bragi;
   abducted by the giant Thjazi, from whom she was rescued.

Also, Ithun, Ithunn. 

• Old Norse Ithunn; perh. derivative of ith deed, feat

Collins Concise English Dictionary © HarperCollins Publishers::

Idun / ˈiːdʊn/, Ithunn noun

1. the goddess of spring who guarded the apples that kept the gods eternally young; wife of Bragi