bar·i·um (bârē-əm, băr-)
1. 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.
2. A radiopaque solution containing barium sulfate that is used to visualize the gastrointestinal tract on x-rays.
baric (-ĭk) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.