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Mare Tyrrhenum

[ ti-ree-nuhm ]
/ tɪˈri nəm /
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noun
(Tyrrhenian Sea) an area in the southern hemisphere of Mars, appearing as a dark region when viewed telescopically from the earth.
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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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