What is "fuamnach"

Fúamnach, or Fuamnach, is Midir's first wife and a witch of the Tuatha Dé Danann in the medieval Irish text Tochmarc Étaíne ("The Wooing of Étaín"). The text describes her as being intelligent (gáeth), cunning (trebar) and "versed in the knowledge and power of the Túatha Dé Danand", explaining that her fosterfather had been the wizard druid Bresal Etarlám. She is said to be of the progeny (clann) of Béothach son of Iardanél, who is probably identical with Béothach son of Iarbonel, the father of the Túatha Dé Danann in the Lebor Gabála Érenn.