1. sodium

noun. (ˈsoʊdiːəm) A silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt).
Synonyms
halite saltwater metal seawater brine Na rock salt atomic number 11 metallic element
Antonyms
fresh water nonmetallic
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2. sodium-vapor lamp

noun. Lamp in which an electric current passed through a tube of sodium vapor makes a yellow light; used is street lighting.
Synonyms
sodium-vapour lamp lamp

3. sodium-vapour lamp

noun. Lamp in which an electric current passed through a tube of sodium vapor makes a yellow light; used is street lighting.
Synonyms
sodium-vapor lamp lamp
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