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Word: ellipsoid (lookup in dictionary) (lookup stats)
Dates: during 1940-1949
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Usage:

...equator is 3,963⅓-miles. Too small, said Izotov; he calculated that in its thickest section the radius is about ½ mile more. The Izotov globe is flattened slightly not only at the poles, like previous globes, but at the equator. Thus the earth, like every ellipsoid, has three axes instead of two and must rotate with a slightly seasick motion...

Author: /time Magazine | Title: Science: Painless Expansion | 7/22/1946 | See Source »

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