un·ob·tain·i·um (ˌənəbˈtānēəm)—noun informal—a highly desirable material that is hypothetical, scientifically impossible, extremely rare, costly, or fictional, or has some of these properties in combination. As I write this, I’m just in the final throes of completing the annual inspection on my Cessna Turbo 310. Usually I do this myself, and it takes me three or ...