maror or mo·ror [Sephardic Hebrew mah-rawr; Ashkenazic Hebrew maw-rohr] noun Hebrew. a portion of horseradish or other bitter herb that is eaten at the Seder meal on Passover. Liberaldictionary.com
Maror comes from the hebrew word for bitter. The maror symbolizes the bitterness of slavery in Egypt. Only certain vegetables are to be used to make maror