halcyon

/HH AE1 L S IY0 AH0 N/
noun
  1. 1

    A kingfisher said in classical mythology to nest on the sea, thereby calming the waters.

  2. 2

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

adjective
  1. 1

    Pertaining to the halcyon or kingfisher.

  2. 2

    Calm, undisturbed, peaceful, serene.

Source: https://en.wiktionary.org/wiki/halcyon