[ 'alɪs(ə)m , ə'lɪs(ə)m ]
■ noun ( plural ~s ) a herbaceous plant which typically bears small white or yellow flowers. [Genera Alyssum and Lobularia : many species.]
Origin
C16: mod. L., from L. alysson , from Gk alusson , from a- 'without' + lussa 'rabies' (referring to early herbalist use).