This word is from EmGee's word list

halcyon

Definition:

marked by peace and prosperity; "a golden era"; "the halcyon days of the clipper trade"

idyllically calm and peaceful; suggesting happy tranquillity; "a halcyon atmosphere"

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

Example:

1.
calm; peaceful; tranquil: halcyon weather.
2.
rich; wealthy; prosperous: halcyon times of peace.
3.
happy; joyful; carefree: halcyon days of youth.
4.
of or pertaining to the halcyon or kingfisher.
–noun
5.
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.
6.
any of various kingfishers, esp. of the genus Halcyon.