semiminor axis

noun
semi·mi·nor axis | \ ˌse-mē-ˈmī-nər- , ˌse-ˌmī- , -mi- \

Definition of semiminor axis 

: one half of the minor axis of an ellipse (such as that formed by the orbit of a planet)

First Known Use of semiminor axis

1909, in the meaning defined above

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The first known use of semiminor axis was in 1909

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