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ultrathin

[uhl-truh-thin] /ˌʌl trəˈθɪn/
adjective
1.
extremely thin:
an ultrathin wristwatch.
Origin of ultrathin
1945-1950
1945-50; ultra- + thin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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