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Sinus Sabaeus

[ see-nuhs sa-bee-uhs, sahy- ]
/ ˈsi nəs sæˈbi əs, ˈsaɪ- /
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noun
an area in the southern hemisphere and near the equator of Mars, appearing dark when viewed telescopically from the earth.
QUIZ
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Question 1 of 9
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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