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Noun
- 1. strontium, Sr, atomic number 38, metallic element, metal
- usage: a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite
- 2. steradian, sr, angular unit
- usage: the unit of solid angle adopted under the Systeme International d'Unites
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Definition and meaning of sr (Dictionary)