THALLIUM

Pronunciation (US):

(GB):

 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:

Nouns denoting substances

Hypernyms ("thallium" 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 ("thallium" 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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