From en.wiktionary.org:
** German
*** Etymology
[de] From [de] with Upper German fortition of intervocalic _-h-_. See the
main entry for more.[1]
*** Pronunciation
- [de]
- [de]
*** Noun
[f]
1. [de] [de]
**** Declension
[f]
*** References
References:
[1]. Szemerenyi, Scripta minora: selected essays in Indo-European, Greek, and Latin, Volume 2, p. 714