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dipyramid

[ dahy-pir-uh-mid ]
/ daɪˈpɪr ə mɪd /
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noun Crystallography.
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Which of the following nouns has an irregular plural form?

OTHER WORDS FROM dipyramid

di·py·ram·i·dal [dahy-pi-ram-i-dl], /ˌdaɪ pɪˈræm ɪ dl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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