ATOMIC NUMBER 81

 Dictionary entry overview: What does atomic number 81 mean? 

• ATOMIC NUMBER 81 (noun)
  The noun ATOMIC NUMBER 81 has 1 sense:

1. 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

  Familiarity information: ATOMIC NUMBER 81 used as a noun is very rare.

 Dictionary entry details 

• ATOMIC NUMBER 81 (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

Classified under:

Nouns denoting substances

Synonyms:

atomic number 81; thallium; Tl

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)