a silver-white, slightly malleable, metallic chemical element, one of the alkaline-earth metals, found as a carbonate or sulfate and used in alloys: symbol, Ba; at. no., 56
Origin of bariumModern Latin ; from Classical Greek barys, heavy (see grave) + -ium
- Symbol Ba A soft, silvery-white or yellowish-white alkaline-earth metal, used to deoxidize copper and to absorb trace gases in vacuum tubes, and used in various alloys. Atomic number 56; atomic weight 137.33; melting point 727°C; boiling point 1,897°C; specific gravity 3.62; valence 2. See Periodic Table.
- A radiopaque solution containing barium sulfate that is used to visualize the gastrointestinal tract on x-rays.
Origin of bariumbar(yta) + –ium.
- A metallic chemical element (symbol Ba) with an atomic number of 56.