radium
[ rey-dee-uh m ]
/ ˈreɪ di əm /
noun
Chemistry.
a highly radioactive metallic element whose decay yields radon gas and alpha rays. Symbol: Ra; atomic weight: 226; atomic number: 88.
a lustrous rayon or silk fabric constructed in plain weave and used in women's apparel, lining, and drapery.
Words nearby radium
radiotropic,
radiovision,
radisectomy,
radish,
radisson,
radium,
radium a,
radium b,
radium emanation,
radium f,
radium sulfate
Example sentences from the Web for radium
British Dictionary definitions for radium
radium
/ (ˈreɪdɪəm) /
noun
- a highly radioactive luminescent white element of the alkaline earth group of metals. It occurs in pitchblende, carnotite, and other uranium ores, and is used in radiotherapy and in luminous paints. Symbol: Ra; atomic no: 88; half-life of most stable isotope, 226 Ra: 1620 years; valency: 2; relative density: 5; melting pt: 700°C; boiling pt: 1140°C
- (as modifier)radium needle
Word Origin for radium
C20: from Latin
radius ray
Medical definitions for radium
radium
[ rā′dē-əm ]
n. Symbol Ra
A luminescent, highly radioactive metallic element found in minute amounts in uranium ores, used as a neutron source for some research purposes, and formerly used in cancer radiotherapy; its most stable isotope is Ra 226 with a half-life of 1,622 years. Atomic number 88.
Scientific definitions for radium
radium
[ rā′dē-əm ]
Ra
A rare, bright-white, highly radioactive element of the alkaline-earth group. It occurs naturally in very small amounts in ores and minerals containing uranium, and it is naturally luminescent. Radium is used as a source of radon gas for the treatment of disease and as a neutron source for scientific research. Its most stable isotope is Ra 226 with a half-life of 1,622 years. Atomic number 88; melting point 700°C; boiling point 1,737°C; valence 2. See Periodic Table.
Cultural definitions for radium
notes for radium
Radium was discovered by the chemists Marie and Pierre
Curie.