Definition of unobtainium in English:

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unobtainium

Pronunciation: /ˌənəbˈtānēəm/
(also unobtanium)

noun

informal
A highly desirable material that is hypothetical, scientifically impossible, extremely rare, costly, or fictional, or has some of these properties in combination: what type of cabling are we talking about, steel, composite, unobtainium?
More example sentences
  • Indeed, the claims made for this technology sometimes make it sound like the legendary aerospace material ‘unobtainium.’
  • Veteran space industry analyst John Pike, director of GlobalSecurity.org, likes to joke that the required substance should be dubbed ‘unobtainium.’
  • But the Japanese 8mm Nambu cartridge might as well have been made of unobtainium.

For editors and proofreaders

Syllabification: un·ob·tain·i·um

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