0 - quranix.org

Ejtaal Arabic Almanac: Lane's Lexicon, Hans Wehr, Lisan al-Arab and others
- why
Perseus: Lane's Lexicon (in text format)
- why
- why (if it is not found in the link above)

The root why (و ه ي) occurs 1 times in Quran, in 1 derived forms:

1
69:16
and the sky will be rent asunder* - for, frail will it have become on that Day - ;