adjective also: halcyonian (ˌhælsɪˈəʊnɪən), halcyonic (ˌhælsɪˈɒnɪk)1. peaceful, gentle, and calm
noun3. Greek mythology a fabulous bird associated with the winter solstice
4. a poetic name for the kingfisher
5. halcyon days
Word origin
C14: from Latin
alcyon, from Greek
alkuōn kingfisher, of uncertain origin