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

 

aster

 noun
noun
BrE BrE//ˈæstə(r)//
 
; NAmE NAmE//ˈæstər//
 
 
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a garden plant that has pink, purple, blue or white flowers with many long narrow petals Word Origin early 17th cent. (in the sense ‘a star’): via Latin from Greek astēr ‘star’.
See the Oxford Advanced American Dictionary entry: aster