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deuterium
noun
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How to pronounce deuterium:

Definition of deuterium:

deuterium (noun):
an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen).
an isotope of hydrogen that has one proton and one neutron in its nucleus and that has twice the mass of ordinary hydrogen

Synonyms for deuterium:

heavy hydrogen
hydrogen atom

Other 4-syllable words like deuterium

Here are some other common words that have 4 syllables, like deuterium does.

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