Source : Webster's Revised Unabridged Dictionary (1913)

Moneywort \Mon"ey*wort`\, n. (Bot.)
   A trailing plant ({Lysimachia Nummularia}), with rounded
   opposite leaves and solitary yellow flowers in their axils.

Source : WordNet®

Lysimachia nummularia
     n : a loosestrife vine [syn: {moneywort}, {creeping Jenny}, {creeping
         Charlie}]