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Definition of Sr
1. Noun. A soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite.
Exact synonyms: Atomic Number 38, Strontium
Generic synonyms: Metal, Metallic Element
Specialized synonyms: Strontium 90
Substance meronyms: Celestite, Strontianite
Generic synonyms: Metal, Metallic Element
Specialized synonyms: Strontium 90
Substance meronyms: Celestite, Strontianite
2. Noun. The unit of solid angle adopted under the Systeme International d'Unites.
Medical Definition of Sr
1. Symbol for strontium. (05 Mar 2000)