1. potassium-argon_dating

noun. geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon.


  • geological dating

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2. potassium

noun. ['pəˈtæsiːəm'] a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite.


  • brine
  • metallic element
  • sylvite
  • seawater
  • atomic number 19
  • sylvine
  • K
  • saltwater
  • carnallite
  • kainite
  • metal


  • nonmetallic

3. tartrate

noun. a salt or ester of tartaric acid.


  • tartar emetic
  • salt
  • antimony potassium tartrate

4. antimony

noun. a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite.


  • metallic element
  • stibnite
  • atomic number 51
  • metal