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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Ezekiel 18:19 מַדֻּ֛עַ ma.Du.a' · Small word: why
Yet say ye, Wherefore doth not the son bear the iniquity of the father? when the son hath done that which is lawful and right, and hath kept all my statutes, and hath done them, he shall surely live.
American Standard Version (1901). Public domain.