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submillimeter

[ suhb-mil-uh-mee-ter ]
/ sʌbˈmɪl əˌmi tər /
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adjective
less than a millimeter in size: a submillimeter wave.
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Origin of submillimeter

First recorded in 1950–55; sub- + millimeter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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