| Noun | 1. | Halcyon - (Greek mythology) a woman who was turned into a kingfisher | |
| 2. | Halcyon - a large kingfisher widely distributed in warmer parts of the Old World | |
| 3. | 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 | |
| Adj. | 1. | halcyon - idyllically calm and peaceful; suggesting happy tranquillity; "a halcyon atmosphere"peaceful - not disturbed by strife or turmoil or war; "a peaceful nation"; "peaceful times"; "a far from peaceful Christmas"; "peaceful sleep" | |
| 2. | halcyon - marked by peace and prosperity; "a golden era"; "the halcyon days of the clipper trade"happy - enjoying or showing or marked by joy or pleasure or good fortune; "a happy smile"; "spent many happy days on the beach"; "a happy marriage" | |