melange (me'-lange also ma,lanj) n-s, origin uncertain (thought to derive from
ancient Terran Franzh): a. mixture of spices; b. spice of Arrakis (Dune) with
geriatric properties first noted by Yanshuph Ashkoko, royal chemist in reign of
Shakkad the Wise; Arrakeen melange, found only in deepest desert sands of
Arrakis, linked to prophetic visions of Paul Muad'Dib (Atreides), first Fremen
Mahdi; also employed by Spacing Guild Navigators and the Bene Gesserit.

-Dictionary Royal fifth edition