- tb by WordNet
nounA metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and...
- pb by WordNet
noun A soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes...
- pbs by WordNet
nounA soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes...
- gb by WordNet
nounA highly toxic chemical nerve agent that inhibits the activity of cholinesterase. synonyms:...
- atomic number 70 by WordNet
nounA soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite...