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Definition of alyssum noun from the Oxford Advanced Learner's Dictionary

 

alyssum

 noun
noun
BrE BrE//ˈælɪsəm//
 
; NAmE NAmE//ˈælɪsəm//
 
; BrE BrE//əˈlɪsəm//
 
; NAmE NAmE//əˈlɪsəm//
 
[countable, uncountable]
 
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one of several types of plant. Some types, with small white, blue, or pink flowers, are common in gardens. Word Origin mid 16th cent. (used loosely to denote various medicinal herbs): modern Latin, from Latin alysson, from Greek alusson, from a- ‘without’ + lussa ‘rabies’ (referring to early herbalist use).
See the Oxford Advanced American Dictionary entry: alyssum