Beryllium

a steel-gray, bivalent, hard, light, metallic element, the salts of which are sweet: used chiefly in copper alloys for better fatigue endurance, in springs, and in electrical contacts. symbol: be; atomic weight: 9.0122; atomic number: 4; specific gravity: 1.8 at 20° c.
historical examples

occult chemistry annie besant and charles w. leadbeater
anything you can do … gordon randall garrett
the last evolution john wood campbell
the great dome on mercury arthur leo zagat
encyclopaedia britannica, 11th edition, volume 3, slice 6 various
deepfreeze robert donald locke
anything you can do … gordon randall garrett
encyclopaedia britannica, 11th edition, volume 7, slice 7 various
a text-book of precious stones for jewelers and the gem-loving public frank bertram wade
a text-book of precious stones for jewelers and the gem-loving public frank bertram wade

noun
a corrosion-resistant toxic silvery-white metallic element that occurs chiefly in beryl and is used mainly in x-ray windows and in the manufacture of alloys. symbol: be; atomic no: 4; atomic wt: 9.012; valency: 2; relative density: 1.848; melting pt: 1289°c; boiling pt: 2472°c former names glucinum, glucinium
n.
beryllium
(bə-rĭl’ē-əm)
symbol be
a hard, lightweight, steel-gray metallic element of the alkaline-earth group, found in various minerals, especially beryl. it has a high melting point and is corrosion-resistant. beryllium is used to make st-rdy, lightweight alloys and aerosp-ce structural materials. it is also used as a neutron moderator in nuclear reactors. atomic number 4; atomic weight 9.0122; melting point 1,278°c; boiling point 2,970°c; specific gravity 1.848; valence 2. see periodic table.