http://www.amazon.com/Illustrated-Ardha ... 8120805070
Illustrated Ardha-Magadhi Dictionary: With Sanskrit, Gujrati, Hindi and English Equivalents, References to the Texts and Copious Quotations (5 vols)
Never knew such dictionary existed until today. I have googled for the pdf version but unfotunately only vol-2 of this 5 vol set dictionary is available on the net. Those who can read Hindi (Devanagari script), can download the pdf version here.