Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: halcyon 'bird believed to bring good weather at sea' (14-19 centuries), from Latin, from Greek alkyon 'kingfisher'

halcyon

 adjective
     
hal‧cy‧on

halcyon days

literary a time in the past when you were very happy
Definition from the Longman Dictionary of Contemporary English
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