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-ium
(redirected from -um)

    Also found in: Medical 0.01 sec.
-ium
suff.
Chemical element or group: californium.
[New Latin -ium, neuter n. suff., from Greek -ion.]
-ium sometimes, -um
suffix forming nouns
1. (Chemistry) indicating a metallic element platinum barium
2. (Chemistry) indicating groups forming positive ions ammonium chloride hydroxonium ion
3. (Life Sciences & Allied Applications / Biology) indicating a biological structure syncytium
[New Latin, from Latin, from Greek -ion, diminutive suffix]
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