1) Fictional material 2) Hypothetical miracle material
Found on
https://www.crosswordclues.com/clue/unobtainium
In engineering, fiction, and thought experiments, unobtainium is any fictional, extremely rare, costly, or impossible material, or (less commonly) device needed to fulfill a given design for a given application. The properties of any particular unobtainium depend on the intended use. For example, a pulley made of unobtainium might be massless and ...
Found on
http://en.wikipedia.org/wiki/Unobtainium
No exact match found.
