1. a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal; [syn: cesium, caesium, Cs, atomic number 55]
WordNet (r) 3.0 (2006):
atomic number 55
n 1: a soft silver-white ductile metallic element (liquid at
normal temperatures); the most electropositive and alkaline
metal [syn: cesium, caesium, Cs, atomic number 55]