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Definition of Atomic number 55
1. Noun. A soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal.
Exact synonyms: Caesium, Cesium, Cs
Generic synonyms: Metal, Metallic Element
Specialized synonyms: Cesium 137
Substance meronyms: Pollucite
Generic synonyms: Metal, Metallic Element
Specialized synonyms: Cesium 137
Substance meronyms: Pollucite