halcyon (Adjective) — Idyllically calm and peaceful; suggesting happy tranquillity. ex. "a halcyon atmosphere"
halcyon (Adjective) — Marked by peace and prosperity. ex. "the halcyon days of the clipper trade"
halcyon (Noun) — (Greek mythology) a woman who was turned into a kingfisher.
halcyon (Noun) — A large kingfisher widely distributed in warmer parts of the Old World.
halcyon (Noun) — 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.