ultrathin

adjective
ul·tra·thin | \ˌəl-trə-ˈthin \

Definition of ultrathin 

: extremely or extraordinarily thin ultrathin phones ultrathin fashion models The molecules ride on the surface like a film of soap and assemble themselves into an ultrathin layer about one-millionth of an inch thick.— Mike May

First Known Use of ultrathin

1851, in the meaning defined above

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The first known use of ultrathin was in 1851

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ultrathin

adjective
ul·tra·thin | \ˌəl-trə-ˈthin \

Medical Definition of ultrathin 

: exceedingly thin ultrathin sections for use in electron microscopy

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