Noun

• S: (n) Alcyone, Halcyon ((Greek mythology) a woman who was turned into a kingfisher)
• domain category
• S: (n) Greek mythology (the mythology of the ancient Greeks)
• instance
• S: (n) Halcyon, genus Halcyon (a large kingfisher widely distributed in warmer parts of the Old World)
• S: (n) halcyon (a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves)
• direct hypernym / inherited hypernym / sister term
• S: (n) mythical being (an imaginary being of myth or fable)

Adjective

• S: (adj) halcyon (idyllically calm and peaceful; suggesting happy tranquillity) "a halcyon atmosphere"
• similar to
• antonym
• S: (adj) golden, halcyon, prosperous (marked by peace and prosperity) "a golden era"; "the halcyon days of the clipper trade"
• similar to
• S: (adj) happy (enjoying or showing or marked by joy or pleasure) "a happy smile"; "spent many happy days on the beach"; "a happy marriage"
• antonym
• W: (adj) unhappy [Indirect via happy] (experiencing or marked by or causing sadness or sorrow or discontent) "unhappy over her departure"; "unhappy with her raise"; "after the argument they lapsed into an unhappy silence"; "had an unhappy time at school"; "the unhappy (or sad) news"; "he looks so sad"