Source : Webster's Revised Unabridged Dictionary (1913)

Amaranthus \Am`a*ran"thus\ ([a^]m`[.a]*r[a^]n"th[u^]s),
Amarantus \Am`a*ran"tus\ ([a^]m`[.a]*r[a^]n"t[u^]s), n.
   Same as {Amaranth}.

Source : WordNet®

Amaranthus
     n : large widely distributed genus of chiefly coarse annual
         herbs [syn: {genus Amaranthus}]