Source : Webster's Revised Unabridged Dictionary (1913)

Lamb's-quarters \Lamb's-quar"ters\, n. (Bot.)
   A name given to several plants of the Goosefoot family,
   sometimes used as pot herbs, as {Chenopodium album} and
   {Atriplex patulsa}.

Source : WordNet®

lamb's-quarters
     n : common weedy European plant introduced into North America;
         often used as a potherb [syn: {pigweed}, {wild spinach},
         {Chenopodium album}]