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apostilb

[ ap-uh-stilb ]
/ ˈæp əˌstɪlb /
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noun Optics.
a unit of luminance equal to one ten thousandth of a lambert.
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Which of the following nouns has an irregular plural form?

Origin of apostilb

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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