terbium

1. (uncountable)A metallic chemical element (symbol Tb) with an atomic number of 65: a soft, silvery-white, rare earth metal that is malleable and ductile.

   Terbium

   те́рбийtérbij

   те́рбійtérbij

   a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite

2. A metallic chemical element (symbol Tb) with an atomic number of 65: a soft, silvery-white, rare earth metal that is malleable and ductile.

   (countable)An atom of this element.

regular