-onium Hear it!

-onium definition

-onium (ō′nē əm)

  1. any of a group of compounds that are isologues of ammonium sulfonium
  2. a cation hydronium

Etymology: < (amm)onium

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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