1. calm; peaceful; tranquil: halcyon weather.
2. rich; wealthy; prosperous: halcyon times of peace.
3. happy; joyful; carefree: halcyon days of youth. noun
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.