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heavy oxygen
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noun
either of the two stable isotopes of oxygen having mass numbers of 17 and 18.
QUIZ
GOOSES. GEESES. I WANT THIS QUIZ ON PLURAL NOUNS!
Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?
Words nearby heavy oxygen
heavy lifting, heavy metal, heavy middleweight, heavy nitrogen, heavy oil, heavy oxygen, heavy particle, heavy petting, heavyset, heavy spar, heavy water
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022