(poetic) A kingfisher bird whose nesting by the sea was believed to calm the wind and waves in classical mythology, and in tudor times, its dead body was said to act as a weather vane when hung from a beam.

A tropical kingfisher of the genus Halcyon, such as the sacred kingfisher (Halcyon sancta) of Australia.

Pertaining to the halcyon or kingfisher.

(figurative) Calm, undisturbed, peaceful, serene.