-ium(redirected from -um)
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Combining form usually denoting a natural element (e.g., polonium).
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
-ium[L. -ium, neuter noun suffix]
1. A suffix used in chemistry for names of elements, e.g., einsteinium.
2. A suffix used as a Latinization of the Greek suffix-ion, e.g., endoneurium
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