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femtometer

[fem-tuh-mee-ter]

noun

Physics.
  1. fermi. fm



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Word History and Origins

Origin of femtometer1

First recorded in 1970–75; femto- + meter 1
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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The detectors must also squelch other vibrations to stabilize the length of each arm to 1 femtometer, the width of a proton.

Read more on Science Magazine

Pohl and his team were surprised to find a lower value for the radius, pegging it at 0.84 femtometer—well outside the range of potential sizes established by earlier measurements.

Read more on Scientific American

The surprise was an answer that was 4 percent smaller, 0.84184 femtometer.

Read more on New York Times

Putting these techniques together gave an answer of about 0.8768 femtometer for the proton’s radius, just less than a quadrillionth of a meter.

Read more on New York Times

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femto-femur