What is Halcyon?

Halcyon definition and meaning on Dictionary terms:
adjective Also halA.cyA.oA.niA.an [hal-see-oh-nee-uhn] /E?hA|la??siE?oE?a??nia??E?n/, halA.cyA.onA.ic [hal-see-on-ik] /E?hA|la??siE?E?na??Eak/.
calm; peaceful; tranquil: halcyon weather.
rich; wealthy; prosperous: halcyon times of peace.
happy; joyful; carefree: halcyon days of youth.
of or relating to the halcyon or kingfisher.

a mythical bird, usually identified with the kingfisher, said to breed about the time of the winter solstice in a nest floating on the sea, and to have the power of charming winds and waves into calmness.
any of various kingfishers, especially of the genus Halcyon.

(initial capital letter) Classical Mythology. Alcyone(def 2).


reference: https://www.dictionary.com/browse/halcyon