bitter herb

  1. an Old World herb, Centaurium erythraea, used dried in medicine as a tonic.
  2. the turtlehead, Chelone glabra, used in medicine as a tonic, cathartic, and anthelmintic.
  3. Judaism. an herb that tastes bitter, as horseradish, traditionally eaten at the Seder, and serving as a reminder of the Israelites' slavery in Egypt. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018