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arc second
or arc-second
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noun
Astronomy. second2 (def. 4).
QUIZ
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Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?
Words nearby arc second
arcology, arcosolium, A.R.C.S., arc sec, arc secant, arc second, arcsin, arc sine, arc spectrum, arc tan, arc tangent
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022