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

 

hyacinth

 noun
noun
BrE BrE//ˈhaɪəsɪnθ//
 
; NAmE NAmE//ˈhaɪəsɪnθ//
 
 
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a plant with a mass of small blue, white or pink flowers with a sweet smell that grow closely together around a thick stem Word Origin mid 16th cent. (denoting a gem): from French hyacinthe, via Latin from Greek huakinthos, denoting a plant identified with the flower in the myth of Hyacinthus, and a gem (perhaps the sapphire). In Greek mythology, Hyacinthus was a boy who Apollo loved but killed accidentally. From his blood Apollo made the hyacinth spring up. The current sense dates from the late 16th cent.
See the Oxford Advanced American Dictionary entry: hyacinth