massless

adjective

mass·​less ˈmas-ləs How to pronounce massless (audio)
: having no mass
a massless particle

Examples of massless in a Sentence

Recent Examples on the Web
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Relativity does indeed state that an object with non-zero mass cannot go at the speed of light, and even massless objects cannot go faster than light. Don Lincoln, Big Think, 29 Aug. 2025 Neutrinos are virtually massless subatomic particles with no charge. Jay Kakade july 20, New Atlas, 20 July 2025 If a certain symmetry in the models was broken, the massless partner would go away, leaving only a massive one. Jennifer Ouellette, Ars Technica, 9 Sep. 2022 According to the Standard Model, two gluons, the massless particles that glue together atomic nuclei, easily interact with each other to double their own number, becoming four gluons. Katie McCormick, Quanta Magazine, 1 Aug. 2022 See All Example Sentences for massless

Word History

First Known Use

1879, in the meaning defined above

Time Traveler
The first known use of massless was in 1879

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Cite this Entry

“Massless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/massless. Accessed 9 Sep. 2025.

Last Updated: - Updated example sentences
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