a pale-yellow, metallic chemical element, one of the alkaline-earth metals, resembling calcium in properties and found only in combination: strontium compounds burn with a red flame and are used in fireworks: symbol, Sr; at. no. 38: a deadly radioactive isotope (strontium-90) is present in the fallout of nuclear explosions
Origin of strontiumModL: see strontia and amp; -ium; so named (1808) by Sir Humphry Davy, who first isolated it
A soft, silvery, easily oxidized metallic element that ignites spontaneously in air when finely divided. Strontium is used in pyrotechnic compounds and various alloys, and as a coating on cathode-ray tubes and related display devices to block x-ray emission. Atomic number 38; atomic weight 87.62; melting point 777°C; boiling point 1,382°C; specific gravity 2.64; valence 2. See Periodic Table.
Origin of strontiumFrom New Latin strontia, strontium oxide, from English strontian; see strontianite.
- A metallic chemical element (symbol Sr) with an atomic number of 38.
- strontian (noun)