1. cesium, caesium, Cs, atomic number 55 - a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
   --₁ is a kind of metallic element, metal
   --₁ is a substance of pollucite
   --₁ has particulars: cesium 137
   

Cesium

Noun:

1. A silvery-white, highly reactive alkali metal element, represented by the symbol Cs on the periodic table.

Sample sentence:

The chemist used cesium in the experiment to observe its unique reaction with water.

Adjective:

1. Related to or characteristic of cesium.

Sample sentence:

The cesium atom has cesium-like properties when it loses an electron.

Links:

• Search for cesium element on Amazon
• Search for cesium compounds on Amazon