Wordnet polsko-angielski 
                         (a ductile grey metallic element of the lanthanide series
used in lighter flints
the most abundant of the rare-earth group) 
cerium, Ce, atomic number 58 
synonim: cer
 (a ductile grey metallic element of the lanthanide series
used in lighter flints
the most abundant of the rare-earth group) 
cerium, Ce, atomic number 58 
synonim: cer