strontium

[stron-shee-uhm, -shuhm, -tee-uhm]
noun Chemistry.
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:
1800–10; stront(ia) + -ium

strontic [stron-tik] , adjective
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World English Dictionary
strontium (ˈstrɒntɪəm)
 
n
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
 
[C19: from New Latin, from strontian]

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Etymonline
Word Origin & History

strontium
light metallic element, 1808, coined in Mod.L. by Eng. 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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American Heritage
Medical Dictionary

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.

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American Heritage
Science Dictionary
strontium   (strŏn'chē-əm, -tē-əm)  Pronunciation Key 
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
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Example sentences
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.
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