Found 1 items, similar to atomic number 81.
English → English (WordNet)
Definition: atomic number 81
atomic number 81
n : a soft gray malleable metallic element that resembles tin
but discolors on exposure to air; it is highly toxic and
is used in rodent and insect poisons; occurs in zinc
blende and some iron ores [syn:
thallium,
Tl]