beryllium
noun
be·ryl·li·um
bə-ˈri-lē-əm 
: a chemical element of the alkaline earth metal group with atomic number 4 that occurs naturally in minerals such as beryl and is steel-gray in color, light and strong but brittle, and is used chiefly as a hardening agent in alloys see Chemical Elements Table
Examples of beryllium in a Sentence
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Emeralds are mainly made up of the mineral beryl, which is made from the elements beryllium, aluminum, silicon and oxygen.
—
Daniel Freedman, The Conversation, 4 Feb. 2025
The main feature is a deformable mirror, which is a thin, reflective surface that can be made from a variety of materials, including glass, beryllium, molybdenum, and composites.
—Sidd Bikkannavar, IEEE Spectrum, 26 Feb. 2010
The coveted minerals include lithium, titanium, cobalt, beryllium, and others required for many of the critical products of the 21st century – from electric vehicle batteries and microchips to aerospace components.
—Howard Lafranchi, The Christian Science Monitor, 20 Mar. 2025
Ukraine Is Mineral Rich Ukraine has some of the world’s largest deposits of graphite, lithium, titanium, beryllium, and uranium, all of which are critical in developing and supporting AI, quantum computing, non-fossiuel propulsion, and other 21st century technologies.
—Eli Amdur, Forbes, 2 Mar. 2025
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Daniel Freedman, The Conversation, 4 Feb. 2025
The main feature is a deformable mirror, which is a thin, reflective surface that can be made from a variety of materials, including glass, beryllium, molybdenum, and composites.
—Sidd Bikkannavar, IEEE Spectrum, 26 Feb. 2010
The coveted minerals include lithium, titanium, cobalt, beryllium, and others required for many of the critical products of the 21st century – from electric vehicle batteries and microchips to aerospace components.
—Howard Lafranchi, The Christian Science Monitor, 20 Mar. 2025
Ukraine Is Mineral Rich Ukraine has some of the world’s largest deposits of graphite, lithium, titanium, beryllium, and uranium, all of which are critical in developing and supporting AI, quantum computing, non-fossiuel propulsion, and other 21st century technologies.
—Eli Amdur, Forbes, 2 Mar. 2025
See All Example Sentences for beryllium
Cite this Entry
“Beryllium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/beryllium. Accessed 12 Apr. 2025.
Copy CitationKids Definition
beryllium
noun
be·ryl·li·um
bə-ˈril-ē-əm
: a steel-gray light strong brittle toxic metallic element used chiefly to help harden alloys see element
Medical Definition
beryllium
noun
be·ryl·li·um
bə-ˈril-ē-əm
: a steel-gray light strong brittle toxic bivalent metallic element used chiefly as a hardening agent in alloys
—symbol Be
see Chemical Elements Table
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