Definition of alyssum

• n. - A genus of cruciferous plants; madwort. The sweet alyssum (A. maritimum), cultivated for bouquets, bears small, white, sweet-scented flowers.
• n. - A genus of cruciferous plants; madwort. The sweet alyssum (A. maritimum), cultivated for bouquets, bears small, white, sweet-scented flowers.