-ium Hear it!

-ium definition

-ium (ē əm, yəm)

    1. forming Modern Latin names for chemical elements sodium
    2. forming the names of certain positive ions ammonium, carbonium
  2. forming the names of certain biological structures conidium, syncytium

Etymology: ModL < L, ending of certain neuter nouns

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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