ultrathin
adjective
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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
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ultrathin
adjective
\
Medical Definition of ultrathin
: exceedingly thin ultrathin sections for use in electron microscopy
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