Source : Webster's Revised Unabridged Dictionary (1913)

Mugwort \Mug"wort`\, n. [AS. mucgwyrt. Cf. {Midge}.] (Bot.)
   A somewhat aromatic composite weed ({Artemisia vulgaris}), at
   one time used medicinally; -- called also {motherwort}.

Source : WordNet®

Artemisia vulgaris
     n : European tufted aromatic perennial herb having hairy red or
         purple stems and dark green leaves downy white below and
         red-brown florets [syn: {common mugwort}]