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ATOMIC NUMBER 81
I. (noun)
Sense 1
Meaning:
A soft grey 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
Synonyms:
atomic number 81; thallium; Tl
Classified under:
Hypernyms ("atomic number 81" is a kind of...):
metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)
Holonyms ("atomic number 81" is a substance of...):
blende; sphalerite; zinc blende (an ore that is the chief source of zinc; consists largely of zinc sulfide in crystalline form)
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