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massless

American  
[mas-lis] / ˈmæs lɪs /

adjective

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


Other Word Forms


Etymology

Origin of massless

First recorded in 1875–80; mass + -less


Example Sentences

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Among them are massless spin waves similar to graphene's electron waves, as well as low dispersion bands associated with localized states and even topological effects that span multiple bands.

From Science Daily ● Mar. 8, 2026

At first, they were predicted to be massless, but now scientists know they must have nonzero mass.

From Scientific American ● Jun. 7, 2023

The nearly massless particles change type as they fly, so an electron neutrino from the Sun can turn into another variety before reaching Earth.

From Science Magazine ● Jan. 11, 2023

Posting publicly on Twitter, TikTok, YouTube, or Instagram is a lot like using a megaphone to scream to a large, massless, faceless crowd.

From Slate ● Nov. 30, 2022

The electromagnetic attraction is pictured as being caused by the exchange of large numbers of virtual massless particles of spin 1, called photons.

From "A Brief History of Time: And Other Essays" by Stephen Hawking

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