What is Nyxis?

Nyxis definition and meaning on Dictionary terms:
noun, plural o-os.
any of several species of Hawaiian honey eaters of the genus Moho, especially the extinct M. nobilis, of the island of Hawaii, that had black plumage and two tufts of yellow plumes used to make ceremonial robes for the Hawaiian kings.


reference: https://www.dictionary.com/browse/nyxis