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femtometer

[ fem-tuh-mee-ter ]
/ ˈfɛm təˌmi tər /
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noun Physics.
fermi. Symbol: fm
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Which of the following nouns has an irregular plural form?

Origin of femtometer

First recorded in 1970–75; femto- + meter1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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