-ium

a suffix found on nouns borrowed from Latin, especially derivatives of verbs ( odium; tedium; colloquium; delirium ), deverbal compounds with the initial element denoting the object of the verb ( nasturtium ), other types of compounds ( equilibrium; millennium ), and derivatives of personal nouns, often denoting the associated status or office ( collegium; consortium; magisterium ); -ium, also occurs in scientific coinages on a Latin model, as in names of metallic elements ( barium; titanium ) and as a Latinization of Gk -ion ( pericardium ).

Origin:
< Neo-Latin, Latin, neuter suffix

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Link To -ium

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-ium is always a great word to know.

So is bezoar. Does it mean:

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

a fool or simpleton; ninny.

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Collins

World English Dictionary

-ium or (sometimes) -um

—*suffix forming nouns*
1.	indicating a metallic element: platinum; barium
2.	(in chemistry) indicating groups forming positive ions: ammonium chloride; hydroxonium ion
3.	indicating a biological structure: syncytium

[New Latin, from Latin, from Greek -ion, diminutive suffix]

-um or (sometimes) -um

—*suffix forming nouns*

[New Latin, from Latin, from Greek -ion, diminutive suffix]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage

Medical Dictionary

-ium suff.
Chemical element or group: californium.

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