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Lobachevski

[ lō′bə-chĕfskē ]
Nikolai Ivanovich 1792-1856
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Russian mathematician who was a pioneer of non-Euclidean geometry.
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Question 1 of 9
Which of the following nouns has an irregular plural form?
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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