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massless

[ mas-lis ]

adjective

, Physics.
  1. pertaining to an elementary particle having zero rest mass, as a photon.


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Other Words From

  • massless·ness noun

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Word History and Origins

Origin of massless1

First recorded in 1875–80; mass + -less

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Example Sentences

If it exists, the graviton is expected to be a massless particle with no electric charge.

If electrons were massless, for example, atoms wouldn’t form.

How, exactly, that transition from massless to massive happened has some big implications for the cosmos.

A reclusive, hypothetical subatomic particle might be creeping into studies of neutrinos, nearly massless particles with no electric charge.

The subatomic particles are so lightweight, they’re almost massless.

In the inside of one there are fly-wheels, in the inside of the other a massless spring.

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mass leavemass man