dark matter

noun

: nonluminous matter not yet directly detected by astronomers that is hypothesized to exist to account for various observed gravitational effects

Examples of dark matter in a Sentence

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The experiment is rather unusual for a dark matter detector, as it is not located deep underground. — Georgina Jedikovska, Interesting Engineering, 7 Oct. 2026 Anyone who regularly follows dark matter news knows that past tantalizing anomalies evaporated as more data came in. — ArsTechnica, 2 Oct. 2026 In the paper bag, there’s a dark matter manhole that leads to Antaan’s (Paul Ben-Victor) alien world. — Ben Travers, IndieWire, 27 Sep. 2026 Many models of dark matter, or other hypothetical physics, call for slightly more or slightly less radiation than what’s expected in standard cosmology. — Cara Giovanetti, The Conversation, 25 Sep. 2026 See All Example Sentences for dark matter

Word History

First Known Use

1933, in the meaning defined above

Time Traveler
The first known use of dark matter was in 1933

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Cite this Entry

“Dark matter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dark%20matter. Accessed 9 Oct. 2026.

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