English noun: atomic number 55 | |||
1. | atomic number 55 (substance) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal | ||
Synonyms | caesium, cesium, Cs | ||
Broader (hypernym) | metal, metallic element | ||
Narrower (hyponym) | cesium 137 | ||
Substance meronym | pollucite | ||