Wormwood

A composite plant (Artemisia Absinthium), having a bitter and slightly aromatic taste, formerly used as a tonic and a vermifuge, and to protect woolen garments from moths. It gives the peculiar flavor to the cordial called absinthe. The volatile oil is a narcotic poison. The term is often extended to other species of the same genus.

Anything very bitter or grievous; bitterness.

any of several low composite herbs of the genera Artemisia or Seriphidium