Definition of


  1. (noun, substance) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal

via WordNet, Princeton University

Synonyms of Cesium

atomic number 55, caesium, cs

Alternate forms of Cesium

Hyponyms: cesium 137

Hypernyms: metal, metallic element

Origin of the word Cesium

  1. coined by Bunsen and Kirchhoff in 1860, from L. caesius "blue-gray," in reference to the two blue lines in its spectrum. more

via Online Etymology Dictionary, ©2001 Douglas Harper

Note: If you're looking to improve your vocabulary right now, we highly recommend Ultimate Vocabulary Software.

Word of the Moment

Hoary Plantain

widely distributed Old World perennial naturalized in North America having finely hairy leaves and inconspicuous white fragrant flowers