high-energy

adjective

high-en·​er·​gy ˈhī-ˈe-nər-jē How to pronounce high-energy (audio)
1
a
: having such speed and kinetic energy as to exhibit relativistic departure from classical laws of motion
used especially of elementary particles whose velocity has been imparted by an accelerator
b
: of or relating to high-energy particles
2
: yielding a relatively large amount of energy when undergoing hydrolysis

Examples of high-energy in a Sentence

Recent Examples on the Web
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An accompanying video set to high-energy rock-dance music shows Maxima smiling in green army fatigues before jumping into a pool, then rock climbing in a helmet. Frank Andrews, CBS News, 5 Feb. 2026 Solar flares are considered to be brief but intense blasts of high-energy radiation from the sun’s surface. Mary Wasson, Austin American Statesman, 5 Feb. 2026 Finally, this gas is processed in a proprietary plasma reforming reactor that breaks down molecules to produce synthesis gas (syngas) — a high-energy mixture of carbon monoxide and hydrogen. Mrigakshi Dixit, Interesting Engineering, 5 Feb. 2026 This causes a blast of high-energy radiation called a gamma-ray burst (GRB), a final screech of gravitational waves, and sends out a spray of neutron-rich matter, which allows a process to occur that generates very heavy but unstable elements. Robert Lea, Space.com, 4 Feb. 2026 See All Example Sentences for high-energy

Word History

First Known Use

1934, in the meaning defined at sense 1a

Time Traveler
The first known use of high-energy was in 1934

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Cite this Entry

“High-energy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/high-energy. Accessed 15 Feb. 2026.

Medical Definition

high-energy

adjective
: yielding a relatively large amount of energy when undergoing hydrolysis
high-energy phosphate bonds in ATP
Last Updated: - Updated example sentences
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