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1. The unit of solid angle adopted under the Système International d'Unités
   - steradian

1. A soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite
   - strontium, atomic number 38

1. Used of the older of two persons of the same name especially used to distinguish a father from his son
   "Bill Adams, Sr.";
   - elder, older

Derived forms: srs

See also: senior

Type of: angular unit, metal, metallic element

Part of: celestite, sphere, strontianite

Encyclopedia: Sr