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strontium

[stron-shee-uh m, -shuh m, -tee-uh m] /ˈstrɒn ʃi əm, -ʃəm, -ti əm/
noun, Chemistry
1.
a bivalent, metallic element whose compounds resemble those of calcium, found in nature only in the combined state, as in strontianite: used in fireworks, flares, and tracer bullets. Symbol: Sr; atomic weight: 87.62; atomic number: 38; specific gravity: 2.6.
Origin
1800-1810
1800-10; stront(ia) + -ium
Related forms
strontic
[stron-tik] /ˈstrɒn tɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for strontium
  • So far the radioactive contamination has been iodine and cesium with no reports of strontium or other non-volatile elements.
  • The rabbits carried strontium and cesium, which emit gamma rays, back out of the area in their digestive tracts.
  • strontium is a natural and commonly occurring element.
  • Naturally occurring strontium is not radioactive and is either referred to as stable strontium or strontium.
British Dictionary definitions for strontium

strontium

/ˈstrɒntɪəm/
noun
1.
a soft silvery-white element of the alkaline earth group of metals, occurring chiefly in celestite and strontianite. Its compounds burn with a crimson flame and are used in fireworks. The radioisotope strontium-90, with a half-life of 28.1 years, is used in nuclear power sources and is a hazardous nuclear fall-out product. Symbol: Sr; atomic no: 38; atomic wt: 87.62; valency: 2; relative density: 2.54; melting pt: 769°C; boiling pt: 1384°C
Word Origin
C19: from New Latin, from strontian
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for strontium

light metallic element, 1808, coined in Modern Latin by English chemist Sir Humphry Davy (1778-1829) from Strontian, name of a parish in Argyllshire, Scotland, the site of lead mines where strontium was first found.

Online Etymology Dictionary, © 2010 Douglas Harper
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strontium in Medicine

strontium stron·ti·um (strŏn'chē-əm, -tē-əm, -shəm)
n.
Symbol Sr
A soft, easily oxidized metallic element that ignites spontaneously in air when finely divided. Atomic number 38; atomic weight 87.62; melting point 777°C; boiling point 1,382°C; specific gravity 2.54; valence 2.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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strontium in Science
strontium
  (strŏn'chē-əm, -tē-əm)   
Symbol Sr
A soft, silvery metallic element of the alkaline-earth group that occurs naturally only as a sulfate or carbonate. One of its isotopes is used in the radiometric dating of rocks. Because strontium salts burn with a red flame, they are used to make fireworks and signal flares. Atomic number 38; atomic weight 87.62; melting point 769°C; boiling point 1,384°C; specific gravity 2.54; valence 2. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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