Definitions for madwortˈmædˌwɜrt, -ˌwɔrt
Random House Webster's College Dictionary
a mat-forming plant, Aurinia saxatilis (or Alyssum saxatille), of the mustard family, having broadly rounded leaves and open clusters of pale yellow flowers.
Origin of madwort:
any garden plant of the genus Alyssum having clusters of small yellow or white flowers
Any of the alyssums.
a genus of cruciferous plants (Alyssum) with white or yellow flowers and rounded pods. A. maritimum is the commonly cultivated sweet alyssum, a fragrant white-flowered annual