Word meanings
Strong's dictionary
or מַדֻּעַ; from מָה and the passive participle of יָדַע; what (is) known?; i.e. (by implication) (adverbially) why?; how, wherefore, why.
Strong's Exhaustive Concordance (public domain)
Full lexicon entry (Brown-Driver-Briggs)
מַדּוּעַ 61 and מַדֻּעַ adv. wherefore?
Every occurrence
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Malachi 2:10 מַדּ֗וּעַ ma.Du.a' · Small word: why
Have we not all one father? hath not one God created us? why do we deal treacherously every man against his brother, profaning the covenant of our fathers?
American Standard Version (1901). Public domain.