Noun
maror (uncountable)
(Judaism) A bitter vegetable, such as horseradish or Romaine lettuce, eaten at the Passover seder as a reminder of the bitterness of slavery in Egypt.
Biblical sources Matzo is mentioned in the Torah several times in relation to The Exodus from Egypt : That night, they are to eat the meat, roasted in the fire; they are to eat it with matzo and maror. Source: Internet
Korech (sandwich) The maror (bitter herb) is placed between two small pieces of matzo, similarly to how the contents of a sandwich are placed between two slices of bread, and eaten. Source: Internet
Maror (bitter herbs) The blessing for the eating of the maror (bitter herbs) is recited and then it is eaten. Source: Internet