ul·​tra·​dense ˌəl-trə-ˈden(t)s How to pronounce ultradense (audio)
: very compact or crowded : extremely or extraordinarily dense
especially, chemistry : having an extremely high mass (see mass entry 2 sense 1c) per unit volume (see volume entry 1 sense 2)
ultradense stars

Examples of ultradense in a Sentence

Recent Examples on the Web When a star collapses into an ultradense object like a pulsar or black hole, some of its matter turns into what’s called gravitational binding energy. Gabriel Popkin, Discover Magazine, 12 Mar. 2015 Seismologists are increasingly seeing small, ultradense pockets of material in the deep mantle, only a few hundred kilometers across, often near the edges of the LLSVPs. Paul Voosen, Science | AAAS, 23 Mar. 2021 Schafer Richardson plans to develop parcels on either side of the parking lot into multifamily mixed-use buildings of the sort that have rapidly transformed the North Loop into an ultradense residential neighborhood over the past decade. Susan Du, Star Tribune, 22 Mar. 2021 Unlike black hole mergers, this kind of collision, a splat between two ultradense stars, yields a pulse of optical light, x-rays and gamma rays. Martin Rees, Scientific American, 18 Aug. 2020 All that remained was an ultradense, fast-spinning fragment of the original star’s core — the pulsar. Corey S Powell, Discover Magazine, 1 Oct. 2014

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'ultradense.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1908, in the meaning defined above

Time Traveler
The first known use of ultradense was in 1908

Dictionary Entries Near ultradense

Cite this Entry

“Ultradense.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultradense. Accessed 21 Jun. 2024.

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