noun
(poetic) A kingfisher whose nesting by the sea was said, in classical mythology, to cause the Gods to restrain the wind and waves.
A tropical kingfisher of the genus Halcyon, such as the sacred kingfisher (Halcyon sancta) of Australia.
adjective
Pertaining to the halcyon or kingfisher.
(figurative) Calm, undisturbed, peaceful, serene.