Unobtanium Definition
noun
A fictitious substance, which, if it existed, would enable one to solve an intractable problem with ease.
Wiktionary
An especially rare component that is almost impossible to get hold of.
Wiktionary
A high tech component that is extremely expensive.
Wiktionary
Origin of Unobtanium
From unobtain- + -ium
From Wiktionary
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