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beryllium
noun
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How to pronounce beryllium:

Definition of beryllium:

beryllium (noun):
a light strong brittle grey toxic bivalent metallic element.
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

Synonyms for beryllium:

metalberylbe

Other 4-syllable words like beryllium

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