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radium
noun
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How to pronounce radium:

Definition of radium:

radium (noun):
an intensely radioactive metallic element that occurs in minute amounts in uranium ores.
an intensely radioactive metallic chemical element that occurs in combination in minute quantities in minerals (such as pitchblende or carnotite), emits alpha particles and gamma rays to form radon, and is used chiefly in the treatment of cancer and in radiographic devices see chemical elements table

Synonyms for radium:

atomic number 88
metal
ra
uranium ore

Other 3-syllable words like radium

Here are some other common words that have 3 syllables, like radium does.

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