Pronunciation: (u-lis'um), [key]
1. any of various plants belonging to the genus Alyssum, of the mustard family, having clusters of small yellow or white flowers.
2. any of several related plants of the genus Aurinia, as A. saxatilis, a widely cultivated species with yellow flowers.
3. See sweet alyssum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.