Definition of halcyon adjective from the Oxford Advanced Learner's Dictionary

 

halcyon

 adjective
adjective
BrE BrE//ˈhælsiən//
 
; NAmE NAmE//ˈhælsiən//
 
[usually before noun](literary) Happiness
 
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peaceful and happy the halcyon days of her youth See related entries: Happiness Word Origin late Middle English (in the mythological sense): via Latin from Greek alkuōn ‘kingfisher’ (also halkuōn, by association with hals ‘sea’ and kuōn ‘conceiving’).
See the Oxford Advanced American Dictionary entry: halcyon