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ultrathin

[ uhl-truh-thin ]
/ ˌʌl trəˈθɪn /
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adjective

extremely thin: an ultrathin wristwatch.

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Origin of ultrathin

First recorded in 1945–50; ultra- + thin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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