Beryllium Definition

A high-melting, lightweight, corrosion-resistant, rigid, steel-gray metallic element used as an aerospace structural material, as a moderator and reflector in nuclear reactors, and in a copper alloy used for springs, electrical contacts, and nonsparking tools. Atomic number 4; atomic weight 9.0122; melting point 1,287°C; boiling point 2,470°C; specific gravity 1.848; valence 2.
American Heritage
A hard, silver-white, metallic chemical element, one of the alkaline-earth metals, found only in combination with others: it forms strong, hard, lightweight alloys with several metals: symbol, Be; at. no. 4
Webster's New World

The chemical element with an atomic number of 4; a light metal with specialist industrial applications.


(physics) The only stable isotope of beryllium, 94Be, having four protons and five neutrons.

  • atomic number 4
  • glucinium
  • be

Origin of Beryllium

  • From New Latin beryllium, from beryllus, from Ancient Greek βήρυλλος (berullos, “beryl”), + -ium.

    From Wiktionary

  • From beryl

    From American Heritage Dictionary of the English Language, 5th Edition

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