Definition of beryllium
: 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
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Merriam-Webster unabridged
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Time Traveler for beryllium
The first known use of beryllium was circa 1847
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