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30-30

[ thur-tee-thur-tee ]
/ ˈθɜr tiˈθɜr ti /
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noun
a rifle using a cartridge approximately .30 inch in diameter, originally having a powder charge of 30 grains but now of various charges.
the cartridge itself.
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Which of the following nouns has an irregular plural form?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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